| /* vi: set sw=4 ts=4: */ |
| /* |
| * awk implementation for busybox |
| * |
| * Copyright (C) 2002 by Dmitry Zakharov <dmit@crp.bank.gov.ua> |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| #include "busybox.h" |
| #include "xregex.h" |
| #include <math.h> |
| |
| |
| #define MAXVARFMT 240 |
| #define MINNVBLOCK 64 |
| |
| /* variable flags */ |
| #define VF_NUMBER 0x0001 /* 1 = primary type is number */ |
| #define VF_ARRAY 0x0002 /* 1 = it's an array */ |
| |
| #define VF_CACHED 0x0100 /* 1 = num/str value has cached str/num eq */ |
| #define VF_USER 0x0200 /* 1 = user input (may be numeric string) */ |
| #define VF_SPECIAL 0x0400 /* 1 = requires extra handling when changed */ |
| #define VF_WALK 0x0800 /* 1 = variable has alloc'd x.walker list */ |
| #define VF_FSTR 0x1000 /* 1 = string points to fstring buffer */ |
| #define VF_CHILD 0x2000 /* 1 = function arg; x.parent points to source */ |
| #define VF_DIRTY 0x4000 /* 1 = variable was set explicitly */ |
| |
| /* these flags are static, don't change them when value is changed */ |
| #define VF_DONTTOUCH (VF_ARRAY | VF_SPECIAL | VF_WALK | VF_CHILD | VF_DIRTY) |
| |
| /* Variable */ |
| typedef struct var_s { |
| unsigned short type; /* flags */ |
| double number; |
| char *string; |
| union { |
| int aidx; /* func arg idx (for compilation stage) */ |
| struct xhash_s *array; /* array ptr */ |
| struct var_s *parent; /* for func args, ptr to actual parameter */ |
| char **walker; /* list of array elements (for..in) */ |
| } x; |
| } var; |
| |
| /* Node chain (pattern-action chain, BEGIN, END, function bodies) */ |
| typedef struct chain_s { |
| struct node_s *first; |
| struct node_s *last; |
| char *programname; |
| } chain; |
| |
| /* Function */ |
| typedef struct func_s { |
| unsigned short nargs; |
| struct chain_s body; |
| } func; |
| |
| /* I/O stream */ |
| typedef struct rstream_s { |
| FILE *F; |
| char *buffer; |
| int adv; |
| int size; |
| int pos; |
| unsigned short is_pipe; |
| } rstream; |
| |
| typedef struct hash_item_s { |
| union { |
| struct var_s v; /* variable/array hash */ |
| struct rstream_s rs; /* redirect streams hash */ |
| struct func_s f; /* functions hash */ |
| } data; |
| struct hash_item_s *next; /* next in chain */ |
| char name[1]; /* really it's longer */ |
| } hash_item; |
| |
| typedef struct xhash_s { |
| unsigned int nel; /* num of elements */ |
| unsigned int csize; /* current hash size */ |
| unsigned int nprime; /* next hash size in PRIMES[] */ |
| unsigned int glen; /* summary length of item names */ |
| struct hash_item_s **items; |
| } xhash; |
| |
| /* Tree node */ |
| typedef struct node_s { |
| uint32_t info; |
| unsigned short lineno; |
| union { |
| struct node_s *n; |
| var *v; |
| int i; |
| char *s; |
| regex_t *re; |
| } l; |
| union { |
| struct node_s *n; |
| regex_t *ire; |
| func *f; |
| int argno; |
| } r; |
| union { |
| struct node_s *n; |
| } a; |
| } node; |
| |
| /* Block of temporary variables */ |
| typedef struct nvblock_s { |
| int size; |
| var *pos; |
| struct nvblock_s *prev; |
| struct nvblock_s *next; |
| var nv[0]; |
| } nvblock; |
| |
| typedef struct tsplitter_s { |
| node n; |
| regex_t re[2]; |
| } tsplitter; |
| |
| /* simple token classes */ |
| /* Order and hex values are very important!!! See next_token() */ |
| #define TC_SEQSTART 1 /* ( */ |
| #define TC_SEQTERM (1 << 1) /* ) */ |
| #define TC_REGEXP (1 << 2) /* /.../ */ |
| #define TC_OUTRDR (1 << 3) /* | > >> */ |
| #define TC_UOPPOST (1 << 4) /* unary postfix operator */ |
| #define TC_UOPPRE1 (1 << 5) /* unary prefix operator */ |
| #define TC_BINOPX (1 << 6) /* two-opnd operator */ |
| #define TC_IN (1 << 7) |
| #define TC_COMMA (1 << 8) |
| #define TC_PIPE (1 << 9) /* input redirection pipe */ |
| #define TC_UOPPRE2 (1 << 10) /* unary prefix operator */ |
| #define TC_ARRTERM (1 << 11) /* ] */ |
| #define TC_GRPSTART (1 << 12) /* { */ |
| #define TC_GRPTERM (1 << 13) /* } */ |
| #define TC_SEMICOL (1 << 14) |
| #define TC_NEWLINE (1 << 15) |
| #define TC_STATX (1 << 16) /* ctl statement (for, next...) */ |
| #define TC_WHILE (1 << 17) |
| #define TC_ELSE (1 << 18) |
| #define TC_BUILTIN (1 << 19) |
| #define TC_GETLINE (1 << 20) |
| #define TC_FUNCDECL (1 << 21) /* `function' `func' */ |
| #define TC_BEGIN (1 << 22) |
| #define TC_END (1 << 23) |
| #define TC_EOF (1 << 24) |
| #define TC_VARIABLE (1 << 25) |
| #define TC_ARRAY (1 << 26) |
| #define TC_FUNCTION (1 << 27) |
| #define TC_STRING (1 << 28) |
| #define TC_NUMBER (1 << 29) |
| |
| #define TC_UOPPRE (TC_UOPPRE1 | TC_UOPPRE2) |
| |
| /* combined token classes */ |
| #define TC_BINOP (TC_BINOPX | TC_COMMA | TC_PIPE | TC_IN) |
| #define TC_UNARYOP (TC_UOPPRE | TC_UOPPOST) |
| #define TC_OPERAND (TC_VARIABLE | TC_ARRAY | TC_FUNCTION | \ |
| TC_BUILTIN | TC_GETLINE | TC_SEQSTART | TC_STRING | TC_NUMBER) |
| |
| #define TC_STATEMNT (TC_STATX | TC_WHILE) |
| #define TC_OPTERM (TC_SEMICOL | TC_NEWLINE) |
| |
| /* word tokens, cannot mean something else if not expected */ |
| #define TC_WORD (TC_IN | TC_STATEMNT | TC_ELSE | TC_BUILTIN | \ |
| TC_GETLINE | TC_FUNCDECL | TC_BEGIN | TC_END) |
| |
| /* discard newlines after these */ |
| #define TC_NOTERM (TC_COMMA | TC_GRPSTART | TC_GRPTERM | \ |
| TC_BINOP | TC_OPTERM) |
| |
| /* what can expression begin with */ |
| #define TC_OPSEQ (TC_OPERAND | TC_UOPPRE | TC_REGEXP) |
| /* what can group begin with */ |
| #define TC_GRPSEQ (TC_OPSEQ | TC_OPTERM | TC_STATEMNT | TC_GRPSTART) |
| |
| /* if previous token class is CONCAT1 and next is CONCAT2, concatenation */ |
| /* operator is inserted between them */ |
| #define TC_CONCAT1 (TC_VARIABLE | TC_ARRTERM | TC_SEQTERM | \ |
| TC_STRING | TC_NUMBER | TC_UOPPOST) |
| #define TC_CONCAT2 (TC_OPERAND | TC_UOPPRE) |
| |
| #define OF_RES1 0x010000 |
| #define OF_RES2 0x020000 |
| #define OF_STR1 0x040000 |
| #define OF_STR2 0x080000 |
| #define OF_NUM1 0x100000 |
| #define OF_CHECKED 0x200000 |
| |
| /* combined operator flags */ |
| #define xx 0 |
| #define xV OF_RES2 |
| #define xS (OF_RES2 | OF_STR2) |
| #define Vx OF_RES1 |
| #define VV (OF_RES1 | OF_RES2) |
| #define Nx (OF_RES1 | OF_NUM1) |
| #define NV (OF_RES1 | OF_NUM1 | OF_RES2) |
| #define Sx (OF_RES1 | OF_STR1) |
| #define SV (OF_RES1 | OF_STR1 | OF_RES2) |
| #define SS (OF_RES1 | OF_STR1 | OF_RES2 | OF_STR2) |
| |
| #define OPCLSMASK 0xFF00 |
| #define OPNMASK 0x007F |
| |
| /* operator priority is a highest byte (even: r->l, odd: l->r grouping) |
| * For builtins it has different meaning: n n s3 s2 s1 v3 v2 v1, |
| * n - min. number of args, vN - resolve Nth arg to var, sN - resolve to string |
| */ |
| #define P(x) (x << 24) |
| #define PRIMASK 0x7F000000 |
| #define PRIMASK2 0x7E000000 |
| |
| /* Operation classes */ |
| |
| #define SHIFT_TIL_THIS 0x0600 |
| #define RECUR_FROM_THIS 0x1000 |
| |
| enum { |
| OC_DELETE=0x0100, OC_EXEC=0x0200, OC_NEWSOURCE=0x0300, |
| OC_PRINT=0x0400, OC_PRINTF=0x0500, OC_WALKINIT=0x0600, |
| |
| OC_BR=0x0700, OC_BREAK=0x0800, OC_CONTINUE=0x0900, |
| OC_EXIT=0x0a00, OC_NEXT=0x0b00, OC_NEXTFILE=0x0c00, |
| OC_TEST=0x0d00, OC_WALKNEXT=0x0e00, |
| |
| OC_BINARY=0x1000, OC_BUILTIN=0x1100, OC_COLON=0x1200, |
| OC_COMMA=0x1300, OC_COMPARE=0x1400, OC_CONCAT=0x1500, |
| OC_FBLTIN=0x1600, OC_FIELD=0x1700, OC_FNARG=0x1800, |
| OC_FUNC=0x1900, OC_GETLINE=0x1a00, OC_IN=0x1b00, |
| OC_LAND=0x1c00, OC_LOR=0x1d00, OC_MATCH=0x1e00, |
| OC_MOVE=0x1f00, OC_PGETLINE=0x2000, OC_REGEXP=0x2100, |
| OC_REPLACE=0x2200, OC_RETURN=0x2300, OC_SPRINTF=0x2400, |
| OC_TERNARY=0x2500, OC_UNARY=0x2600, OC_VAR=0x2700, |
| OC_DONE=0x2800, |
| |
| ST_IF=0x3000, ST_DO=0x3100, ST_FOR=0x3200, |
| ST_WHILE=0x3300 |
| }; |
| |
| /* simple builtins */ |
| enum { |
| F_in=0, F_rn, F_co, F_ex, F_lg, F_si, F_sq, F_sr, |
| F_ti, F_le, F_sy, F_ff, F_cl |
| }; |
| |
| /* builtins */ |
| enum { |
| B_a2=0, B_ix, B_ma, B_sp, B_ss, B_ti, B_lo, B_up, |
| B_ge, B_gs, B_su, |
| B_an, B_co, B_ls, B_or, B_rs, B_xo, |
| }; |
| |
| /* tokens and their corresponding info values */ |
| |
| #define NTC "\377" /* switch to next token class (tc<<1) */ |
| #define NTCC '\377' |
| |
| #define OC_B OC_BUILTIN |
| |
| static char * const tokenlist = |
| "\1(" NTC |
| "\1)" NTC |
| "\1/" NTC /* REGEXP */ |
| "\2>>" "\1>" "\1|" NTC /* OUTRDR */ |
| "\2++" "\2--" NTC /* UOPPOST */ |
| "\2++" "\2--" "\1$" NTC /* UOPPRE1 */ |
| "\2==" "\1=" "\2+=" "\2-=" /* BINOPX */ |
| "\2*=" "\2/=" "\2%=" "\2^=" |
| "\1+" "\1-" "\3**=" "\2**" |
| "\1/" "\1%" "\1^" "\1*" |
| "\2!=" "\2>=" "\2<=" "\1>" |
| "\1<" "\2!~" "\1~" "\2&&" |
| "\2||" "\1?" "\1:" NTC |
| "\2in" NTC |
| "\1," NTC |
| "\1|" NTC |
| "\1+" "\1-" "\1!" NTC /* UOPPRE2 */ |
| "\1]" NTC |
| "\1{" NTC |
| "\1}" NTC |
| "\1;" NTC |
| "\1\n" NTC |
| "\2if" "\2do" "\3for" "\5break" /* STATX */ |
| "\10continue" "\6delete" "\5print" |
| "\6printf" "\4next" "\10nextfile" |
| "\6return" "\4exit" NTC |
| "\5while" NTC |
| "\4else" NTC |
| |
| "\3and" "\5compl" "\6lshift" "\2or" |
| "\6rshift" "\3xor" |
| "\5close" "\6system" "\6fflush" "\5atan2" /* BUILTIN */ |
| "\3cos" "\3exp" "\3int" "\3log" |
| "\4rand" "\3sin" "\4sqrt" "\5srand" |
| "\6gensub" "\4gsub" "\5index" "\6length" |
| "\5match" "\5split" "\7sprintf" "\3sub" |
| "\6substr" "\7systime" "\10strftime" |
| "\7tolower" "\7toupper" NTC |
| "\7getline" NTC |
| "\4func" "\10function" NTC |
| "\5BEGIN" NTC |
| "\3END" "\0" |
| ; |
| |
| static const uint32_t tokeninfo[] = { |
| |
| 0, |
| 0, |
| OC_REGEXP, |
| xS|'a', xS|'w', xS|'|', |
| OC_UNARY|xV|P(9)|'p', OC_UNARY|xV|P(9)|'m', |
| OC_UNARY|xV|P(9)|'P', OC_UNARY|xV|P(9)|'M', |
| OC_FIELD|xV|P(5), |
| OC_COMPARE|VV|P(39)|5, OC_MOVE|VV|P(74), |
| OC_REPLACE|NV|P(74)|'+', OC_REPLACE|NV|P(74)|'-', |
| OC_REPLACE|NV|P(74)|'*', OC_REPLACE|NV|P(74)|'/', |
| OC_REPLACE|NV|P(74)|'%', OC_REPLACE|NV|P(74)|'&', |
| OC_BINARY|NV|P(29)|'+', OC_BINARY|NV|P(29)|'-', |
| OC_REPLACE|NV|P(74)|'&', OC_BINARY|NV|P(15)|'&', |
| OC_BINARY|NV|P(25)|'/', OC_BINARY|NV|P(25)|'%', |
| OC_BINARY|NV|P(15)|'&', OC_BINARY|NV|P(25)|'*', |
| OC_COMPARE|VV|P(39)|4, OC_COMPARE|VV|P(39)|3, |
| OC_COMPARE|VV|P(39)|0, OC_COMPARE|VV|P(39)|1, |
| OC_COMPARE|VV|P(39)|2, OC_MATCH|Sx|P(45)|'!', |
| OC_MATCH|Sx|P(45)|'~', OC_LAND|Vx|P(55), |
| OC_LOR|Vx|P(59), OC_TERNARY|Vx|P(64)|'?', |
| OC_COLON|xx|P(67)|':', |
| OC_IN|SV|P(49), |
| OC_COMMA|SS|P(80), |
| OC_PGETLINE|SV|P(37), |
| OC_UNARY|xV|P(19)|'+', OC_UNARY|xV|P(19)|'-', |
| OC_UNARY|xV|P(19)|'!', |
| 0, |
| 0, |
| 0, |
| 0, |
| 0, |
| ST_IF, ST_DO, ST_FOR, OC_BREAK, |
| OC_CONTINUE, OC_DELETE|Vx, OC_PRINT, |
| OC_PRINTF, OC_NEXT, OC_NEXTFILE, |
| OC_RETURN|Vx, OC_EXIT|Nx, |
| ST_WHILE, |
| 0, |
| |
| OC_B|B_an|P(0x83), OC_B|B_co|P(0x41), OC_B|B_ls|P(0x83), OC_B|B_or|P(0x83), |
| OC_B|B_rs|P(0x83), OC_B|B_xo|P(0x83), |
| OC_FBLTIN|Sx|F_cl, OC_FBLTIN|Sx|F_sy, OC_FBLTIN|Sx|F_ff, OC_B|B_a2|P(0x83), |
| OC_FBLTIN|Nx|F_co, OC_FBLTIN|Nx|F_ex, OC_FBLTIN|Nx|F_in, OC_FBLTIN|Nx|F_lg, |
| OC_FBLTIN|F_rn, OC_FBLTIN|Nx|F_si, OC_FBLTIN|Nx|F_sq, OC_FBLTIN|Nx|F_sr, |
| OC_B|B_ge|P(0xd6), OC_B|B_gs|P(0xb6), OC_B|B_ix|P(0x9b), OC_FBLTIN|Sx|F_le, |
| OC_B|B_ma|P(0x89), OC_B|B_sp|P(0x8b), OC_SPRINTF, OC_B|B_su|P(0xb6), |
| OC_B|B_ss|P(0x8f), OC_FBLTIN|F_ti, OC_B|B_ti|P(0x0b), |
| OC_B|B_lo|P(0x49), OC_B|B_up|P(0x49), |
| OC_GETLINE|SV|P(0), |
| 0, 0, |
| 0, |
| 0 |
| }; |
| |
| /* internal variable names and their initial values */ |
| /* asterisk marks SPECIAL vars; $ is just no-named Field0 */ |
| enum { |
| CONVFMT=0, OFMT, FS, OFS, |
| ORS, RS, RT, FILENAME, |
| SUBSEP, ARGIND, ARGC, ARGV, |
| ERRNO, FNR, |
| NR, NF, IGNORECASE, |
| ENVIRON, F0, _intvarcount_ |
| }; |
| |
| static char * vNames = |
| "CONVFMT\0" "OFMT\0" "FS\0*" "OFS\0" |
| "ORS\0" "RS\0*" "RT\0" "FILENAME\0" |
| "SUBSEP\0" "ARGIND\0" "ARGC\0" "ARGV\0" |
| "ERRNO\0" "FNR\0" |
| "NR\0" "NF\0*" "IGNORECASE\0*" |
| "ENVIRON\0" "$\0*" "\0"; |
| |
| static char * vValues = |
| "%.6g\0" "%.6g\0" " \0" " \0" |
| "\n\0" "\n\0" "\0" "\0" |
| "\034\0" |
| "\377"; |
| |
| /* hash size may grow to these values */ |
| #define FIRST_PRIME 61; |
| static const unsigned int PRIMES[] = { 251, 1021, 4093, 16381, 65521 }; |
| enum { NPRIMES = sizeof(PRIMES) / sizeof(unsigned int) }; |
| |
| /* globals */ |
| |
| extern char **environ; |
| |
| static var * V[_intvarcount_]; |
| static chain beginseq, mainseq, endseq, *seq; |
| static int nextrec, nextfile; |
| static node *break_ptr, *continue_ptr; |
| static rstream *iF; |
| static xhash *vhash, *ahash, *fdhash, *fnhash; |
| static char *programname; |
| static short lineno; |
| static int is_f0_split; |
| static int nfields; |
| static var *Fields; |
| static tsplitter fsplitter, rsplitter; |
| static nvblock *cb; |
| static char *pos; |
| static char *buf; |
| static int icase; |
| static int exiting; |
| |
| static struct { |
| uint32_t tclass; |
| uint32_t info; |
| char *string; |
| double number; |
| short lineno; |
| int rollback; |
| } t; |
| |
| /* function prototypes */ |
| static void handle_special(var *); |
| static node *parse_expr(uint32_t); |
| static void chain_group(void); |
| static var *evaluate(node *, var *); |
| static rstream *next_input_file(void); |
| static int fmt_num(char *, int, const char *, double, int); |
| static int awk_exit(int) ATTRIBUTE_NORETURN; |
| |
| /* ---- error handling ---- */ |
| |
| static const char EMSG_INTERNAL_ERROR[] = "Internal error"; |
| static const char EMSG_UNEXP_EOS[] = "Unexpected end of string"; |
| static const char EMSG_UNEXP_TOKEN[] = "Unexpected token"; |
| static const char EMSG_DIV_BY_ZERO[] = "Division by zero"; |
| static const char EMSG_INV_FMT[] = "Invalid format specifier"; |
| static const char EMSG_TOO_FEW_ARGS[] = "Too few arguments for builtin"; |
| static const char EMSG_NOT_ARRAY[] = "Not an array"; |
| static const char EMSG_POSSIBLE_ERROR[] = "Possible syntax error"; |
| static const char EMSG_UNDEF_FUNC[] = "Call to undefined function"; |
| #ifndef CONFIG_FEATURE_AWK_MATH |
| static const char EMSG_NO_MATH[] = "Math support is not compiled in"; |
| #endif |
| |
| static void syntax_error(const char * const message) ATTRIBUTE_NORETURN; |
| static void syntax_error(const char * const message) |
| { |
| bb_error_msg_and_die("%s:%i: %s", programname, lineno, message); |
| } |
| |
| #define runtime_error(x) syntax_error(x) |
| |
| |
| /* ---- hash stuff ---- */ |
| |
| static unsigned int hashidx(const char *name) |
| { |
| unsigned int idx=0; |
| |
| while (*name) idx = *name++ + (idx << 6) - idx; |
| return idx; |
| } |
| |
| /* create new hash */ |
| static xhash *hash_init(void) |
| { |
| xhash *newhash; |
| |
| newhash = (xhash *)xzalloc(sizeof(xhash)); |
| newhash->csize = FIRST_PRIME; |
| newhash->items = (hash_item **)xzalloc(newhash->csize * sizeof(hash_item *)); |
| |
| return newhash; |
| } |
| |
| /* find item in hash, return ptr to data, NULL if not found */ |
| static void *hash_search(xhash *hash, const char *name) |
| { |
| hash_item *hi; |
| |
| hi = hash->items [ hashidx(name) % hash->csize ]; |
| while (hi) { |
| if (strcmp(hi->name, name) == 0) |
| return &(hi->data); |
| hi = hi->next; |
| } |
| return NULL; |
| } |
| |
| /* grow hash if it becomes too big */ |
| static void hash_rebuild(xhash *hash) |
| { |
| unsigned int newsize, i, idx; |
| hash_item **newitems, *hi, *thi; |
| |
| if (hash->nprime == NPRIMES) |
| return; |
| |
| newsize = PRIMES[hash->nprime++]; |
| newitems = (hash_item **)xzalloc(newsize * sizeof(hash_item *)); |
| |
| for (i=0; i<hash->csize; i++) { |
| hi = hash->items[i]; |
| while (hi) { |
| thi = hi; |
| hi = thi->next; |
| idx = hashidx(thi->name) % newsize; |
| thi->next = newitems[idx]; |
| newitems[idx] = thi; |
| } |
| } |
| |
| free(hash->items); |
| hash->csize = newsize; |
| hash->items = newitems; |
| } |
| |
| /* find item in hash, add it if necessary. Return ptr to data */ |
| static void *hash_find(xhash *hash, const char *name) |
| { |
| hash_item *hi; |
| unsigned int idx; |
| int l; |
| |
| hi = hash_search(hash, name); |
| if (! hi) { |
| if (++hash->nel / hash->csize > 10) |
| hash_rebuild(hash); |
| |
| l = strlen(name) + 1; |
| hi = xzalloc(sizeof(hash_item) + l); |
| memcpy(hi->name, name, l); |
| |
| idx = hashidx(name) % hash->csize; |
| hi->next = hash->items[idx]; |
| hash->items[idx] = hi; |
| hash->glen += l; |
| } |
| return &(hi->data); |
| } |
| |
| #define findvar(hash, name) (var *) hash_find ( (hash) , (name) ) |
| #define newvar(name) (var *) hash_find ( vhash , (name) ) |
| #define newfile(name) (rstream *) hash_find ( fdhash , (name) ) |
| #define newfunc(name) (func *) hash_find ( fnhash , (name) ) |
| |
| static void hash_remove(xhash *hash, const char *name) |
| { |
| hash_item *hi, **phi; |
| |
| phi = &(hash->items[ hashidx(name) % hash->csize ]); |
| while (*phi) { |
| hi = *phi; |
| if (strcmp(hi->name, name) == 0) { |
| hash->glen -= (strlen(name) + 1); |
| hash->nel--; |
| *phi = hi->next; |
| free(hi); |
| break; |
| } |
| phi = &(hi->next); |
| } |
| } |
| |
| /* ------ some useful functions ------ */ |
| |
| static void skip_spaces(char **s) |
| { |
| char *p = *s; |
| |
| while(*p == ' ' || *p == '\t' || |
| (*p == '\\' && *(p+1) == '\n' && (++p, ++t.lineno))) { |
| p++; |
| } |
| *s = p; |
| } |
| |
| static char *nextword(char **s) |
| { |
| char *p = *s; |
| |
| while (*(*s)++) ; |
| |
| return p; |
| } |
| |
| static char nextchar(char **s) |
| { |
| char c, *pps; |
| |
| c = *((*s)++); |
| pps = *s; |
| if (c == '\\') c = bb_process_escape_sequence((const char**)s); |
| if (c == '\\' && *s == pps) c = *((*s)++); |
| return c; |
| } |
| |
| static int ATTRIBUTE_ALWAYS_INLINE isalnum_(int c) |
| { |
| return (isalnum(c) || c == '_'); |
| } |
| |
| static FILE *afopen(const char *path, const char *mode) |
| { |
| return (*path == '-' && *(path+1) == '\0') ? stdin : xfopen(path, mode); |
| } |
| |
| /* -------- working with variables (set/get/copy/etc) -------- */ |
| |
| static xhash *iamarray(var *v) |
| { |
| var *a = v; |
| |
| while (a->type & VF_CHILD) |
| a = a->x.parent; |
| |
| if (! (a->type & VF_ARRAY)) { |
| a->type |= VF_ARRAY; |
| a->x.array = hash_init(); |
| } |
| return a->x.array; |
| } |
| |
| static void clear_array(xhash *array) |
| { |
| unsigned int i; |
| hash_item *hi, *thi; |
| |
| for (i=0; i<array->csize; i++) { |
| hi = array->items[i]; |
| while (hi) { |
| thi = hi; |
| hi = hi->next; |
| free(thi->data.v.string); |
| free(thi); |
| } |
| array->items[i] = NULL; |
| } |
| array->glen = array->nel = 0; |
| } |
| |
| /* clear a variable */ |
| static var *clrvar(var *v) |
| { |
| if (!(v->type & VF_FSTR)) |
| free(v->string); |
| |
| v->type &= VF_DONTTOUCH; |
| v->type |= VF_DIRTY; |
| v->string = NULL; |
| return v; |
| } |
| |
| /* assign string value to variable */ |
| static var *setvar_p(var *v, char *value) |
| { |
| clrvar(v); |
| v->string = value; |
| handle_special(v); |
| |
| return v; |
| } |
| |
| /* same as setvar_p but make a copy of string */ |
| static var *setvar_s(var *v, const char *value) |
| { |
| return setvar_p(v, (value && *value) ? xstrdup(value) : NULL); |
| } |
| |
| /* same as setvar_s but set USER flag */ |
| static var *setvar_u(var *v, const char *value) |
| { |
| setvar_s(v, value); |
| v->type |= VF_USER; |
| return v; |
| } |
| |
| /* set array element to user string */ |
| static void setari_u(var *a, int idx, const char *s) |
| { |
| var *v; |
| static char sidx[12]; |
| |
| sprintf(sidx, "%d", idx); |
| v = findvar(iamarray(a), sidx); |
| setvar_u(v, s); |
| } |
| |
| /* assign numeric value to variable */ |
| static var *setvar_i(var *v, double value) |
| { |
| clrvar(v); |
| v->type |= VF_NUMBER; |
| v->number = value; |
| handle_special(v); |
| return v; |
| } |
| |
| static char *getvar_s(var *v) |
| { |
| /* if v is numeric and has no cached string, convert it to string */ |
| if ((v->type & (VF_NUMBER | VF_CACHED)) == VF_NUMBER) { |
| fmt_num(buf, MAXVARFMT, getvar_s(V[CONVFMT]), v->number, TRUE); |
| v->string = xstrdup(buf); |
| v->type |= VF_CACHED; |
| } |
| return (v->string == NULL) ? "" : v->string; |
| } |
| |
| static double getvar_i(var *v) |
| { |
| char *s; |
| |
| if ((v->type & (VF_NUMBER | VF_CACHED)) == 0) { |
| v->number = 0; |
| s = v->string; |
| if (s && *s) { |
| v->number = strtod(s, &s); |
| if (v->type & VF_USER) { |
| skip_spaces(&s); |
| if (*s != '\0') |
| v->type &= ~VF_USER; |
| } |
| } else { |
| v->type &= ~VF_USER; |
| } |
| v->type |= VF_CACHED; |
| } |
| return v->number; |
| } |
| |
| static var *copyvar(var *dest, const var *src) |
| { |
| if (dest != src) { |
| clrvar(dest); |
| dest->type |= (src->type & ~VF_DONTTOUCH); |
| dest->number = src->number; |
| if (src->string) |
| dest->string = xstrdup(src->string); |
| } |
| handle_special(dest); |
| return dest; |
| } |
| |
| static var *incvar(var *v) |
| { |
| return setvar_i(v, getvar_i(v)+1.); |
| } |
| |
| /* return true if v is number or numeric string */ |
| static int is_numeric(var *v) |
| { |
| getvar_i(v); |
| return ((v->type ^ VF_DIRTY) & (VF_NUMBER | VF_USER | VF_DIRTY)); |
| } |
| |
| /* return 1 when value of v corresponds to true, 0 otherwise */ |
| static int istrue(var *v) |
| { |
| if (is_numeric(v)) |
| return (v->number == 0) ? 0 : 1; |
| else |
| return (v->string && *(v->string)) ? 1 : 0; |
| } |
| |
| /* temporary variables allocator. Last allocated should be first freed */ |
| static var *nvalloc(int n) |
| { |
| nvblock *pb = NULL; |
| var *v, *r; |
| int size; |
| |
| while (cb) { |
| pb = cb; |
| if ((cb->pos - cb->nv) + n <= cb->size) break; |
| cb = cb->next; |
| } |
| |
| if (! cb) { |
| size = (n <= MINNVBLOCK) ? MINNVBLOCK : n; |
| cb = (nvblock *)xmalloc(sizeof(nvblock) + size * sizeof(var)); |
| cb->size = size; |
| cb->pos = cb->nv; |
| cb->prev = pb; |
| cb->next = NULL; |
| if (pb) pb->next = cb; |
| } |
| |
| v = r = cb->pos; |
| cb->pos += n; |
| |
| while (v < cb->pos) { |
| v->type = 0; |
| v->string = NULL; |
| v++; |
| } |
| |
| return r; |
| } |
| |
| static void nvfree(var *v) |
| { |
| var *p; |
| |
| if (v < cb->nv || v >= cb->pos) |
| runtime_error(EMSG_INTERNAL_ERROR); |
| |
| for (p=v; p<cb->pos; p++) { |
| if ((p->type & (VF_ARRAY|VF_CHILD)) == VF_ARRAY) { |
| clear_array(iamarray(p)); |
| free(p->x.array->items); |
| free(p->x.array); |
| } |
| if (p->type & VF_WALK) |
| free(p->x.walker); |
| |
| clrvar(p); |
| } |
| |
| cb->pos = v; |
| while (cb->prev && cb->pos == cb->nv) { |
| cb = cb->prev; |
| } |
| } |
| |
| /* ------- awk program text parsing ------- */ |
| |
| /* Parse next token pointed by global pos, place results into global t. |
| * If token isn't expected, give away. Return token class |
| */ |
| static uint32_t next_token(uint32_t expected) |
| { |
| char *p, *pp, *s; |
| char *tl; |
| uint32_t tc; |
| const uint32_t *ti; |
| int l; |
| static int concat_inserted; |
| static uint32_t save_tclass, save_info; |
| static uint32_t ltclass = TC_OPTERM; |
| |
| if (t.rollback) { |
| |
| t.rollback = FALSE; |
| |
| } else if (concat_inserted) { |
| |
| concat_inserted = FALSE; |
| t.tclass = save_tclass; |
| t.info = save_info; |
| |
| } else { |
| |
| p = pos; |
| |
| readnext: |
| skip_spaces(&p); |
| lineno = t.lineno; |
| if (*p == '#') |
| while (*p != '\n' && *p != '\0') p++; |
| |
| if (*p == '\n') |
| t.lineno++; |
| |
| if (*p == '\0') { |
| tc = TC_EOF; |
| |
| } else if (*p == '\"') { |
| /* it's a string */ |
| t.string = s = ++p; |
| while (*p != '\"') { |
| if (*p == '\0' || *p == '\n') |
| syntax_error(EMSG_UNEXP_EOS); |
| *(s++) = nextchar(&p); |
| } |
| p++; |
| *s = '\0'; |
| tc = TC_STRING; |
| |
| } else if ((expected & TC_REGEXP) && *p == '/') { |
| /* it's regexp */ |
| t.string = s = ++p; |
| while (*p != '/') { |
| if (*p == '\0' || *p == '\n') |
| syntax_error(EMSG_UNEXP_EOS); |
| if ((*s++ = *p++) == '\\') { |
| pp = p; |
| *(s-1) = bb_process_escape_sequence((const char **)&p); |
| if (*pp == '\\') *s++ = '\\'; |
| if (p == pp) *s++ = *p++; |
| } |
| } |
| p++; |
| *s = '\0'; |
| tc = TC_REGEXP; |
| |
| } else if (*p == '.' || isdigit(*p)) { |
| /* it's a number */ |
| t.number = strtod(p, &p); |
| if (*p == '.') |
| syntax_error(EMSG_UNEXP_TOKEN); |
| tc = TC_NUMBER; |
| |
| } else { |
| /* search for something known */ |
| tl = tokenlist; |
| tc = 0x00000001; |
| ti = tokeninfo; |
| while (*tl) { |
| l = *(tl++); |
| if (l == NTCC) { |
| tc <<= 1; |
| continue; |
| } |
| /* if token class is expected, token |
| * matches and it's not a longer word, |
| * then this is what we are looking for |
| */ |
| if ((tc & (expected | TC_WORD | TC_NEWLINE)) && |
| *tl == *p && strncmp(p, tl, l) == 0 && |
| !((tc & TC_WORD) && isalnum_(*(p + l)))) { |
| t.info = *ti; |
| p += l; |
| break; |
| } |
| ti++; |
| tl += l; |
| } |
| |
| if (! *tl) { |
| /* it's a name (var/array/function), |
| * otherwise it's something wrong |
| */ |
| if (! isalnum_(*p)) |
| syntax_error(EMSG_UNEXP_TOKEN); |
| |
| t.string = --p; |
| while(isalnum_(*(++p))) { |
| *(p-1) = *p; |
| } |
| *(p-1) = '\0'; |
| tc = TC_VARIABLE; |
| /* also consume whitespace between functionname and bracket */ |
| if (! (expected & TC_VARIABLE)) skip_spaces(&p); |
| if (*p == '(') { |
| tc = TC_FUNCTION; |
| } else { |
| if (*p == '[') { |
| p++; |
| tc = TC_ARRAY; |
| } |
| } |
| } |
| } |
| pos = p; |
| |
| /* skipping newlines in some cases */ |
| if ((ltclass & TC_NOTERM) && (tc & TC_NEWLINE)) |
| goto readnext; |
| |
| /* insert concatenation operator when needed */ |
| if ((ltclass&TC_CONCAT1) && (tc&TC_CONCAT2) && (expected&TC_BINOP)) { |
| concat_inserted = TRUE; |
| save_tclass = tc; |
| save_info = t.info; |
| tc = TC_BINOP; |
| t.info = OC_CONCAT | SS | P(35); |
| } |
| |
| t.tclass = tc; |
| } |
| ltclass = t.tclass; |
| |
| /* Are we ready for this? */ |
| if (! (ltclass & expected)) |
| syntax_error((ltclass & (TC_NEWLINE | TC_EOF)) ? |
| EMSG_UNEXP_EOS : EMSG_UNEXP_TOKEN); |
| |
| return ltclass; |
| } |
| |
| static void rollback_token(void) { t.rollback = TRUE; } |
| |
| static node *new_node(uint32_t info) |
| { |
| node *n; |
| |
| n = (node *)xzalloc(sizeof(node)); |
| n->info = info; |
| n->lineno = lineno; |
| return n; |
| } |
| |
| static node *mk_re_node(char *s, node *n, regex_t *re) |
| { |
| n->info = OC_REGEXP; |
| n->l.re = re; |
| n->r.ire = re + 1; |
| xregcomp(re, s, REG_EXTENDED); |
| xregcomp(re+1, s, REG_EXTENDED | REG_ICASE); |
| |
| return n; |
| } |
| |
| static node *condition(void) |
| { |
| next_token(TC_SEQSTART); |
| return parse_expr(TC_SEQTERM); |
| } |
| |
| /* parse expression terminated by given argument, return ptr |
| * to built subtree. Terminator is eaten by parse_expr */ |
| static node *parse_expr(uint32_t iexp) |
| { |
| node sn; |
| node *cn = &sn; |
| node *vn, *glptr; |
| uint32_t tc, xtc; |
| var *v; |
| |
| sn.info = PRIMASK; |
| sn.r.n = glptr = NULL; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP | iexp; |
| |
| while (! ((tc = next_token(xtc)) & iexp)) { |
| if (glptr && (t.info == (OC_COMPARE|VV|P(39)|2))) { |
| /* input redirection (<) attached to glptr node */ |
| cn = glptr->l.n = new_node(OC_CONCAT|SS|P(37)); |
| cn->a.n = glptr; |
| xtc = TC_OPERAND | TC_UOPPRE; |
| glptr = NULL; |
| |
| } else if (tc & (TC_BINOP | TC_UOPPOST)) { |
| /* for binary and postfix-unary operators, jump back over |
| * previous operators with higher priority */ |
| vn = cn; |
| while ( ((t.info & PRIMASK) > (vn->a.n->info & PRIMASK2)) || |
| ((t.info == vn->info) && ((t.info & OPCLSMASK) == OC_COLON)) ) |
| vn = vn->a.n; |
| if ((t.info & OPCLSMASK) == OC_TERNARY) |
| t.info += P(6); |
| cn = vn->a.n->r.n = new_node(t.info); |
| cn->a.n = vn->a.n; |
| if (tc & TC_BINOP) { |
| cn->l.n = vn; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP; |
| if ((t.info & OPCLSMASK) == OC_PGETLINE) { |
| /* it's a pipe */ |
| next_token(TC_GETLINE); |
| /* give maximum priority to this pipe */ |
| cn->info &= ~PRIMASK; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp; |
| } |
| } else { |
| cn->r.n = vn; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp; |
| } |
| vn->a.n = cn; |
| |
| } else { |
| /* for operands and prefix-unary operators, attach them |
| * to last node */ |
| vn = cn; |
| cn = vn->r.n = new_node(t.info); |
| cn->a.n = vn; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP; |
| if (tc & (TC_OPERAND | TC_REGEXP)) { |
| xtc = TC_UOPPRE | TC_UOPPOST | TC_BINOP | TC_OPERAND | iexp; |
| /* one should be very careful with switch on tclass - |
| * only simple tclasses should be used! */ |
| switch (tc) { |
| case TC_VARIABLE: |
| case TC_ARRAY: |
| cn->info = OC_VAR; |
| if ((v = hash_search(ahash, t.string)) != NULL) { |
| cn->info = OC_FNARG; |
| cn->l.i = v->x.aidx; |
| } else { |
| cn->l.v = newvar(t.string); |
| } |
| if (tc & TC_ARRAY) { |
| cn->info |= xS; |
| cn->r.n = parse_expr(TC_ARRTERM); |
| } |
| break; |
| |
| case TC_NUMBER: |
| case TC_STRING: |
| cn->info = OC_VAR; |
| v = cn->l.v = xzalloc(sizeof(var)); |
| if (tc & TC_NUMBER) |
| setvar_i(v, t.number); |
| else |
| setvar_s(v, t.string); |
| break; |
| |
| case TC_REGEXP: |
| mk_re_node(t.string, cn, |
| (regex_t *)xzalloc(sizeof(regex_t)*2)); |
| break; |
| |
| case TC_FUNCTION: |
| cn->info = OC_FUNC; |
| cn->r.f = newfunc(t.string); |
| cn->l.n = condition(); |
| break; |
| |
| case TC_SEQSTART: |
| cn = vn->r.n = parse_expr(TC_SEQTERM); |
| cn->a.n = vn; |
| break; |
| |
| case TC_GETLINE: |
| glptr = cn; |
| xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp; |
| break; |
| |
| case TC_BUILTIN: |
| cn->l.n = condition(); |
| break; |
| } |
| } |
| } |
| } |
| return sn.r.n; |
| } |
| |
| /* add node to chain. Return ptr to alloc'd node */ |
| static node *chain_node(uint32_t info) |
| { |
| node *n; |
| |
| if (! seq->first) |
| seq->first = seq->last = new_node(0); |
| |
| if (seq->programname != programname) { |
| seq->programname = programname; |
| n = chain_node(OC_NEWSOURCE); |
| n->l.s = xstrdup(programname); |
| } |
| |
| n = seq->last; |
| n->info = info; |
| seq->last = n->a.n = new_node(OC_DONE); |
| |
| return n; |
| } |
| |
| static void chain_expr(uint32_t info) |
| { |
| node *n; |
| |
| n = chain_node(info); |
| n->l.n = parse_expr(TC_OPTERM | TC_GRPTERM); |
| if (t.tclass & TC_GRPTERM) |
| rollback_token(); |
| } |
| |
| static node *chain_loop(node *nn) |
| { |
| node *n, *n2, *save_brk, *save_cont; |
| |
| save_brk = break_ptr; |
| save_cont = continue_ptr; |
| |
| n = chain_node(OC_BR | Vx); |
| continue_ptr = new_node(OC_EXEC); |
| break_ptr = new_node(OC_EXEC); |
| chain_group(); |
| n2 = chain_node(OC_EXEC | Vx); |
| n2->l.n = nn; |
| n2->a.n = n; |
| continue_ptr->a.n = n2; |
| break_ptr->a.n = n->r.n = seq->last; |
| |
| continue_ptr = save_cont; |
| break_ptr = save_brk; |
| |
| return n; |
| } |
| |
| /* parse group and attach it to chain */ |
| static void chain_group(void) |
| { |
| uint32_t c; |
| node *n, *n2, *n3; |
| |
| do { |
| c = next_token(TC_GRPSEQ); |
| } while (c & TC_NEWLINE); |
| |
| if (c & TC_GRPSTART) { |
| while(next_token(TC_GRPSEQ | TC_GRPTERM) != TC_GRPTERM) { |
| if (t.tclass & TC_NEWLINE) continue; |
| rollback_token(); |
| chain_group(); |
| } |
| } else if (c & (TC_OPSEQ | TC_OPTERM)) { |
| rollback_token(); |
| chain_expr(OC_EXEC | Vx); |
| } else { /* TC_STATEMNT */ |
| switch (t.info & OPCLSMASK) { |
| case ST_IF: |
| n = chain_node(OC_BR | Vx); |
| n->l.n = condition(); |
| chain_group(); |
| n2 = chain_node(OC_EXEC); |
| n->r.n = seq->last; |
| if (next_token(TC_GRPSEQ | TC_GRPTERM | TC_ELSE)==TC_ELSE) { |
| chain_group(); |
| n2->a.n = seq->last; |
| } else { |
| rollback_token(); |
| } |
| break; |
| |
| case ST_WHILE: |
| n2 = condition(); |
| n = chain_loop(NULL); |
| n->l.n = n2; |
| break; |
| |
| case ST_DO: |
| n2 = chain_node(OC_EXEC); |
| n = chain_loop(NULL); |
| n2->a.n = n->a.n; |
| next_token(TC_WHILE); |
| n->l.n = condition(); |
| break; |
| |
| case ST_FOR: |
| next_token(TC_SEQSTART); |
| n2 = parse_expr(TC_SEMICOL | TC_SEQTERM); |
| if (t.tclass & TC_SEQTERM) { /* for-in */ |
| if ((n2->info & OPCLSMASK) != OC_IN) |
| syntax_error(EMSG_UNEXP_TOKEN); |
| n = chain_node(OC_WALKINIT | VV); |
| n->l.n = n2->l.n; |
| n->r.n = n2->r.n; |
| n = chain_loop(NULL); |
| n->info = OC_WALKNEXT | Vx; |
| n->l.n = n2->l.n; |
| } else { /* for(;;) */ |
| n = chain_node(OC_EXEC | Vx); |
| n->l.n = n2; |
| n2 = parse_expr(TC_SEMICOL); |
| n3 = parse_expr(TC_SEQTERM); |
| n = chain_loop(n3); |
| n->l.n = n2; |
| if (! n2) |
| n->info = OC_EXEC; |
| } |
| break; |
| |
| case OC_PRINT: |
| case OC_PRINTF: |
| n = chain_node(t.info); |
| n->l.n = parse_expr(TC_OPTERM | TC_OUTRDR | TC_GRPTERM); |
| if (t.tclass & TC_OUTRDR) { |
| n->info |= t.info; |
| n->r.n = parse_expr(TC_OPTERM | TC_GRPTERM); |
| } |
| if (t.tclass & TC_GRPTERM) |
| rollback_token(); |
| break; |
| |
| case OC_BREAK: |
| n = chain_node(OC_EXEC); |
| n->a.n = break_ptr; |
| break; |
| |
| case OC_CONTINUE: |
| n = chain_node(OC_EXEC); |
| n->a.n = continue_ptr; |
| break; |
| |
| /* delete, next, nextfile, return, exit */ |
| default: |
| chain_expr(t.info); |
| |
| } |
| } |
| } |
| |
| static void parse_program(char *p) |
| { |
| uint32_t tclass; |
| node *cn; |
| func *f; |
| var *v; |
| |
| pos = p; |
| t.lineno = 1; |
| while((tclass = next_token(TC_EOF | TC_OPSEQ | TC_GRPSTART | |
| TC_OPTERM | TC_BEGIN | TC_END | TC_FUNCDECL)) != TC_EOF) { |
| |
| if (tclass & TC_OPTERM) |
| continue; |
| |
| seq = &mainseq; |
| if (tclass & TC_BEGIN) { |
| seq = &beginseq; |
| chain_group(); |
| |
| } else if (tclass & TC_END) { |
| seq = &endseq; |
| chain_group(); |
| |
| } else if (tclass & TC_FUNCDECL) { |
| next_token(TC_FUNCTION); |
| pos++; |
| f = newfunc(t.string); |
| f->body.first = NULL; |
| f->nargs = 0; |
| while(next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) { |
| v = findvar(ahash, t.string); |
| v->x.aidx = (f->nargs)++; |
| |
| if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM) |
| break; |
| } |
| seq = &(f->body); |
| chain_group(); |
| clear_array(ahash); |
| |
| } else if (tclass & TC_OPSEQ) { |
| rollback_token(); |
| cn = chain_node(OC_TEST); |
| cn->l.n = parse_expr(TC_OPTERM | TC_EOF | TC_GRPSTART); |
| if (t.tclass & TC_GRPSTART) { |
| rollback_token(); |
| chain_group(); |
| } else { |
| chain_node(OC_PRINT); |
| } |
| cn->r.n = mainseq.last; |
| |
| } else /* if (tclass & TC_GRPSTART) */ { |
| rollback_token(); |
| chain_group(); |
| } |
| } |
| } |
| |
| |
| /* -------- program execution part -------- */ |
| |
| static node *mk_splitter(char *s, tsplitter *spl) |
| { |
| regex_t *re, *ire; |
| node *n; |
| |
| re = &spl->re[0]; |
| ire = &spl->re[1]; |
| n = &spl->n; |
| if ((n->info & OPCLSMASK) == OC_REGEXP) { |
| regfree(re); |
| regfree(ire); |
| } |
| if (strlen(s) > 1) { |
| mk_re_node(s, n, re); |
| } else { |
| n->info = (uint32_t) *s; |
| } |
| |
| return n; |
| } |
| |
| /* use node as a regular expression. Supplied with node ptr and regex_t |
| * storage space. Return ptr to regex (if result points to preg, it should |
| * be later regfree'd manually |
| */ |
| static regex_t *as_regex(node *op, regex_t *preg) |
| { |
| var *v; |
| char *s; |
| |
| if ((op->info & OPCLSMASK) == OC_REGEXP) { |
| return icase ? op->r.ire : op->l.re; |
| } else { |
| v = nvalloc(1); |
| s = getvar_s(evaluate(op, v)); |
| xregcomp(preg, s, icase ? REG_EXTENDED | REG_ICASE : REG_EXTENDED); |
| nvfree(v); |
| return preg; |
| } |
| } |
| |
| /* gradually increasing buffer */ |
| static void qrealloc(char **b, int n, int *size) |
| { |
| if (! *b || n >= *size) |
| *b = xrealloc(*b, *size = n + (n>>1) + 80); |
| } |
| |
| /* resize field storage space */ |
| static void fsrealloc(int size) |
| { |
| static int maxfields = 0; |
| int i; |
| |
| if (size >= maxfields) { |
| i = maxfields; |
| maxfields = size + 16; |
| Fields = (var *)xrealloc(Fields, maxfields * sizeof(var)); |
| for (; i<maxfields; i++) { |
| Fields[i].type = VF_SPECIAL; |
| Fields[i].string = NULL; |
| } |
| } |
| |
| if (size < nfields) { |
| for (i=size; i<nfields; i++) { |
| clrvar(Fields+i); |
| } |
| } |
| nfields = size; |
| } |
| |
| static int awk_split(char *s, node *spl, char **slist) |
| { |
| int l, n=0; |
| char c[4]; |
| char *s1; |
| regmatch_t pmatch[2]; |
| |
| /* in worst case, each char would be a separate field */ |
| *slist = s1 = xstrndup(s, strlen(s) * 2 + 3); |
| |
| c[0] = c[1] = (char)spl->info; |
| c[2] = c[3] = '\0'; |
| if (*getvar_s(V[RS]) == '\0') c[2] = '\n'; |
| |
| if ((spl->info & OPCLSMASK) == OC_REGEXP) { /* regex split */ |
| while (*s) { |
| l = strcspn(s, c+2); |
| if (regexec(icase ? spl->r.ire : spl->l.re, s, 1, pmatch, 0) == 0 && |
| pmatch[0].rm_so <= l) { |
| l = pmatch[0].rm_so; |
| if (pmatch[0].rm_eo == 0) { l++; pmatch[0].rm_eo++; } |
| } else { |
| pmatch[0].rm_eo = l; |
| if (*(s+l)) pmatch[0].rm_eo++; |
| } |
| |
| memcpy(s1, s, l); |
| *(s1+l) = '\0'; |
| nextword(&s1); |
| s += pmatch[0].rm_eo; |
| n++; |
| } |
| } else if (c[0] == '\0') { /* null split */ |
| while(*s) { |
| *(s1++) = *(s++); |
| *(s1++) = '\0'; |
| n++; |
| } |
| } else if (c[0] != ' ') { /* single-character split */ |
| if (icase) { |
| c[0] = toupper(c[0]); |
| c[1] = tolower(c[1]); |
| } |
| if (*s1) n++; |
| while ((s1 = strpbrk(s1, c))) { |
| *(s1++) = '\0'; |
| n++; |
| } |
| } else { /* space split */ |
| while (*s) { |
| s = skip_whitespace(s); |
| if (! *s) break; |
| n++; |
| while (*s && !isspace(*s)) |
| *(s1++) = *(s++); |
| *(s1++) = '\0'; |
| } |
| } |
| return n; |
| } |
| |
| static void split_f0(void) |
| { |
| static char *fstrings = NULL; |
| int i, n; |
| char *s; |
| |
| if (is_f0_split) |
| return; |
| |
| is_f0_split = TRUE; |
| free(fstrings); |
| fsrealloc(0); |
| n = awk_split(getvar_s(V[F0]), &fsplitter.n, &fstrings); |
| fsrealloc(n); |
| s = fstrings; |
| for (i=0; i<n; i++) { |
| Fields[i].string = nextword(&s); |
| Fields[i].type |= (VF_FSTR | VF_USER | VF_DIRTY); |
| } |
| |
| /* set NF manually to avoid side effects */ |
| clrvar(V[NF]); |
| V[NF]->type = VF_NUMBER | VF_SPECIAL; |
| V[NF]->number = nfields; |
| } |
| |
| /* perform additional actions when some internal variables changed */ |
| static void handle_special(var *v) |
| { |
| int n; |
| char *b, *sep, *s; |
| int sl, l, len, i, bsize; |
| |
| if (! (v->type & VF_SPECIAL)) |
| return; |
| |
| if (v == V[NF]) { |
| n = (int)getvar_i(v); |
| fsrealloc(n); |
| |
| /* recalculate $0 */ |
| sep = getvar_s(V[OFS]); |
| sl = strlen(sep); |
| b = NULL; |
| len = 0; |
| for (i=0; i<n; i++) { |
| s = getvar_s(&Fields[i]); |
| l = strlen(s); |
| if (b) { |
| memcpy(b+len, sep, sl); |
| len += sl; |
| } |
| qrealloc(&b, len+l+sl, &bsize); |
| memcpy(b+len, s, l); |
| len += l; |
| } |
| if (b) b[len] = '\0'; |
| setvar_p(V[F0], b); |
| is_f0_split = TRUE; |
| |
| } else if (v == V[F0]) { |
| is_f0_split = FALSE; |
| |
| } else if (v == V[FS]) { |
| mk_splitter(getvar_s(v), &fsplitter); |
| |
| } else if (v == V[RS]) { |
| mk_splitter(getvar_s(v), &rsplitter); |
| |
| } else if (v == V[IGNORECASE]) { |
| icase = istrue(v); |
| |
| } else { /* $n */ |
| n = getvar_i(V[NF]); |
| setvar_i(V[NF], n > v-Fields ? n : v-Fields+1); |
| /* right here v is invalid. Just to note... */ |
| } |
| } |
| |
| /* step through func/builtin/etc arguments */ |
| static node *nextarg(node **pn) |
| { |
| node *n; |
| |
| n = *pn; |
| if (n && (n->info & OPCLSMASK) == OC_COMMA) { |
| *pn = n->r.n; |
| n = n->l.n; |
| } else { |
| *pn = NULL; |
| } |
| return n; |
| } |
| |
| static void hashwalk_init(var *v, xhash *array) |
| { |
| char **w; |
| hash_item *hi; |
| int i; |
| |
| if (v->type & VF_WALK) |
| free(v->x.walker); |
| |
| v->type |= VF_WALK; |
| w = v->x.walker = (char **)xzalloc(2 + 2*sizeof(char *) + array->glen); |
| *w = *(w+1) = (char *)(w + 2); |
| for (i=0; i<array->csize; i++) { |
| hi = array->items[i]; |
| while(hi) { |
| strcpy(*w, hi->name); |
| nextword(w); |
| hi = hi->next; |
| } |
| } |
| } |
| |
| static int hashwalk_next(var *v) |
| { |
| char **w; |
| |
| w = v->x.walker; |
| if (*(w+1) == *w) |
| return FALSE; |
| |
| setvar_s(v, nextword(w+1)); |
| return TRUE; |
| } |
| |
| /* evaluate node, return 1 when result is true, 0 otherwise */ |
| static int ptest(node *pattern) |
| { |
| static var v; |
| return istrue(evaluate(pattern, &v)); |
| } |
| |
| /* read next record from stream rsm into a variable v */ |
| static int awk_getline(rstream *rsm, var *v) |
| { |
| char *b; |
| regmatch_t pmatch[2]; |
| int a, p, pp=0, size; |
| int fd, so, eo, r, rp; |
| char c, *m, *s; |
| |
| /* we're using our own buffer since we need access to accumulating |
| * characters |
| */ |
| fd = fileno(rsm->F); |
| m = rsm->buffer; |
| a = rsm->adv; |
| p = rsm->pos; |
| size = rsm->size; |
| c = (char) rsplitter.n.info; |
| rp = 0; |
| |
| if (! m) qrealloc(&m, 256, &size); |
| do { |
| b = m + a; |
| so = eo = p; |
| r = 1; |
| if (p > 0) { |
| if ((rsplitter.n.info & OPCLSMASK) == OC_REGEXP) { |
| if (regexec(icase ? rsplitter.n.r.ire : rsplitter.n.l.re, |
| b, 1, pmatch, 0) == 0) { |
| so = pmatch[0].rm_so; |
| eo = pmatch[0].rm_eo; |
| if (b[eo] != '\0') |
| break; |
| } |
| } else if (c != '\0') { |
| s = strchr(b+pp, c); |
| if (! s) s = memchr(b+pp, '\0', p - pp); |
| if (s) { |
| so = eo = s-b; |
| eo++; |
| break; |
| } |
| } else { |
| while (b[rp] == '\n') |
| rp++; |
| s = strstr(b+rp, "\n\n"); |
| if (s) { |
| so = eo = s-b; |
| while (b[eo] == '\n') eo++; |
| if (b[eo] != '\0') |
| break; |
| } |
| } |
| } |
| |
| if (a > 0) { |
| memmove(m, (const void *)(m+a), p+1); |
| b = m; |
| a = 0; |
| } |
| |
| qrealloc(&m, a+p+128, &size); |
| b = m + a; |
| pp = p; |
| p += safe_read(fd, b+p, size-p-1); |
| if (p < pp) { |
| p = 0; |
| r = 0; |
| setvar_i(V[ERRNO], errno); |
| } |
| b[p] = '\0'; |
| |
| } while (p > pp); |
| |
| if (p == 0) { |
| r--; |
| } else { |
| c = b[so]; b[so] = '\0'; |
| setvar_s(v, b+rp); |
| v->type |= VF_USER; |
| b[so] = c; |
| c = b[eo]; b[eo] = '\0'; |
| setvar_s(V[RT], b+so); |
| b[eo] = c; |
| } |
| |
| rsm->buffer = m; |
| rsm->adv = a + eo; |
| rsm->pos = p - eo; |
| rsm->size = size; |
| |
| return r; |
| } |
| |
| static int fmt_num(char *b, int size, const char *format, double n, int int_as_int) |
| { |
| int r=0; |
| char c; |
| const char *s=format; |
| |
| if (int_as_int && n == (int)n) { |
| r = snprintf(b, size, "%d", (int)n); |
| } else { |
| do { c = *s; } while (*s && *++s); |
| if (strchr("diouxX", c)) { |
| r = snprintf(b, size, format, (int)n); |
| } else if (strchr("eEfgG", c)) { |
| r = snprintf(b, size, format, n); |
| } else { |
| runtime_error(EMSG_INV_FMT); |
| } |
| } |
| return r; |
| } |
| |
| |
| /* formatted output into an allocated buffer, return ptr to buffer */ |
| static char *awk_printf(node *n) |
| { |
| char *b = NULL; |
| char *fmt, *s, *s1, *f; |
| int i, j, incr, bsize; |
| char c, c1; |
| var *v, *arg; |
| |
| v = nvalloc(1); |
| fmt = f = xstrdup(getvar_s(evaluate(nextarg(&n), v))); |
| |
| i = 0; |
| while (*f) { |
| s = f; |
| while (*f && (*f != '%' || *(++f) == '%')) |
| f++; |
| while (*f && !isalpha(*f)) |
| f++; |
| |
| incr = (f - s) + MAXVARFMT; |
| qrealloc(&b, incr+i, &bsize); |
| c = *f; if (c != '\0') f++; |
| c1 = *f ; *f = '\0'; |
| arg = evaluate(nextarg(&n), v); |
| |
| j = i; |
| if (c == 'c' || !c) { |
| i += sprintf(b+i, s, |
| is_numeric(arg) ? (char)getvar_i(arg) : *getvar_s(arg)); |
| |
| } else if (c == 's') { |
| s1 = getvar_s(arg); |
| qrealloc(&b, incr+i+strlen(s1), &bsize); |
| i += sprintf(b+i, s, s1); |
| |
| } else { |
| i += fmt_num(b+i, incr, s, getvar_i(arg), FALSE); |
| } |
| *f = c1; |
| |
| /* if there was an error while sprintf, return value is negative */ |
| if (i < j) i = j; |
| |
| } |
| |
| b = xrealloc(b, i+1); |
| free(fmt); |
| nvfree(v); |
| b[i] = '\0'; |
| return b; |
| } |
| |
| /* common substitution routine |
| * replace (nm) substring of (src) that match (n) with (repl), store |
| * result into (dest), return number of substitutions. If nm=0, replace |
| * all matches. If src or dst is NULL, use $0. If ex=TRUE, enable |
| * subexpression matching (\1-\9) |
| */ |
| static int awk_sub(node *rn, char *repl, int nm, var *src, var *dest, int ex) |
| { |
| char *ds = NULL; |
| char *sp, *s; |
| int c, i, j, di, rl, so, eo, nbs, n, dssize; |
| regmatch_t pmatch[10]; |
| regex_t sreg, *re; |
| |
| re = as_regex(rn, &sreg); |
| if (! src) src = V[F0]; |
| if (! dest) dest = V[F0]; |
| |
| i = di = 0; |
| sp = getvar_s(src); |
| rl = strlen(repl); |
| while (regexec(re, sp, 10, pmatch, sp==getvar_s(src) ? 0:REG_NOTBOL) == 0) { |
| so = pmatch[0].rm_so; |
| eo = pmatch[0].rm_eo; |
| |
| qrealloc(&ds, di + eo + rl, &dssize); |
| memcpy(ds + di, sp, eo); |
| di += eo; |
| if (++i >= nm) { |
| /* replace */ |
| di -= (eo - so); |
| nbs = 0; |
| for (s = repl; *s; s++) { |
| ds[di++] = c = *s; |
| if (c == '\\') { |
| nbs++; |
| continue; |
| } |
| if (c == '&' || (ex && c >= '0' && c <= '9')) { |
| di -= ((nbs + 3) >> 1); |
| j = 0; |
| if (c != '&') { |
| j = c - '0'; |
| nbs++; |
| } |
| if (nbs % 2) { |
| ds[di++] = c; |
| } else { |
| n = pmatch[j].rm_eo - pmatch[j].rm_so; |
| qrealloc(&ds, di + rl + n, &dssize); |
| memcpy(ds + di, sp + pmatch[j].rm_so, n); |
| di += n; |
| } |
| } |
| nbs = 0; |
| } |
| } |
| |
| sp += eo; |
| if (i == nm) break; |
| if (eo == so) { |
| if (! (ds[di++] = *sp++)) break; |
| } |
| } |
| |
| qrealloc(&ds, di + strlen(sp), &dssize); |
| strcpy(ds + di, sp); |
| setvar_p(dest, ds); |
| if (re == &sreg) regfree(re); |
| return i; |
| } |
| |
| static var *exec_builtin(node *op, var *res) |
| { |
| int (*to_xxx)(int); |
| var *tv; |
| node *an[4]; |
| var *av[4]; |
| char *as[4]; |
| regmatch_t pmatch[2]; |
| regex_t sreg, *re; |
| static tsplitter tspl; |
| node *spl; |
| uint32_t isr, info; |
| int nargs; |
| time_t tt; |
| char *s, *s1; |
| int i, l, ll, n; |
| |
| tv = nvalloc(4); |
| isr = info = op->info; |
| op = op->l.n; |
| |
| av[2] = av[3] = NULL; |
| for (i=0 ; i<4 && op ; i++) { |
| an[i] = nextarg(&op); |
| if (isr & 0x09000000) av[i] = evaluate(an[i], &tv[i]); |
| if (isr & 0x08000000) as[i] = getvar_s(av[i]); |
| isr >>= 1; |
| } |
| |
| nargs = i; |
| if (nargs < (info >> 30)) |
| runtime_error(EMSG_TOO_FEW_ARGS); |
| |
| switch (info & OPNMASK) { |
| |
| case B_a2: |
| #ifdef CONFIG_FEATURE_AWK_MATH |
| setvar_i(res, atan2(getvar_i(av[i]), getvar_i(av[1]))); |
| #else |
| runtime_error(EMSG_NO_MATH); |
| #endif |
| break; |
| |
| case B_sp: |
| if (nargs > 2) { |
| spl = (an[2]->info & OPCLSMASK) == OC_REGEXP ? |
| an[2] : mk_splitter(getvar_s(evaluate(an[2], &tv[2])), &tspl); |
| } else { |
| spl = &fsplitter.n; |
| } |
| |
| n = awk_split(as[0], spl, &s); |
| s1 = s; |
| clear_array(iamarray(av[1])); |
| for (i=1; i<=n; i++) |
| setari_u(av[1], i, nextword(&s1)); |
| free(s); |
| setvar_i(res, n); |
| break; |
| |
| case B_ss: |
| l = strlen(as[0]); |
| i = getvar_i(av[1]) - 1; |
| if (i>l) i=l; if (i<0) i=0; |
| n = (nargs > 2) ? getvar_i(av[2]) : l-i; |
| if (n<0) n=0; |
| s = xmalloc(n+1); |
| strncpy(s, as[0]+i, n); |
| s[n] = '\0'; |
| setvar_p(res, s); |
| break; |
| |
| case B_an: |
| setvar_i(res, (long)getvar_i(av[0]) & (long)getvar_i(av[1])); |
| break; |
| |
| case B_co: |
| setvar_i(res, ~(long)getvar_i(av[0])); |
| break; |
| |
| case B_ls: |
| setvar_i(res, (long)getvar_i(av[0]) << (long)getvar_i(av[1])); |
| break; |
| |
| case B_or: |
| setvar_i(res, (long)getvar_i(av[0]) | (long)getvar_i(av[1])); |
| break; |
| |
| case B_rs: |
| setvar_i(res, (long)((unsigned long)getvar_i(av[0]) >> (unsigned long)getvar_i(av[1]))); |
| break; |
| |
| case B_xo: |
| setvar_i(res, (long)getvar_i(av[0]) ^ (long)getvar_i(av[1])); |
| break; |
| |
| case B_lo: |
| to_xxx = tolower; |
| goto lo_cont; |
| |
| case B_up: |
| to_xxx = toupper; |
| lo_cont: |
| s1 = s = xstrdup(as[0]); |
| while (*s1) { |
| *s1 = (*to_xxx)(*s1); |
| s1++; |
| } |
| setvar_p(res, s); |
| break; |
| |
| case B_ix: |
| n = 0; |
| ll = strlen(as[1]); |
| l = strlen(as[0]) - ll; |
| if (ll > 0 && l >= 0) { |
| if (! icase) { |
| s = strstr(as[0], as[1]); |
| if (s) n = (s - as[0]) + 1; |
| } else { |
| /* this piece of code is terribly slow and |
| * really should be rewritten |
| */ |
| for (i=0; i<=l; i++) { |
| if (strncasecmp(as[0]+i, as[1], ll) == 0) { |
| n = i+1; |
| break; |
| } |
| } |
| } |
| } |
| setvar_i(res, n); |
| break; |
| |
| case B_ti: |
| if (nargs > 1) |
| tt = getvar_i(av[1]); |
| else |
| time(&tt); |
| s = (nargs > 0) ? as[0] : "%a %b %d %H:%M:%S %Z %Y"; |
| i = strftime(buf, MAXVARFMT, s, localtime(&tt)); |
| buf[i] = '\0'; |
| setvar_s(res, buf); |
| break; |
| |
| case B_ma: |
| re = as_regex(an[1], &sreg); |
| n = regexec(re, as[0], 1, pmatch, 0); |
| if (n == 0) { |
| pmatch[0].rm_so++; |
| pmatch[0].rm_eo++; |
| } else { |
| pmatch[0].rm_so = 0; |
| pmatch[0].rm_eo = -1; |
| } |
| setvar_i(newvar("RSTART"), pmatch[0].rm_so); |
| setvar_i(newvar("RLENGTH"), pmatch[0].rm_eo - pmatch[0].rm_so); |
| setvar_i(res, pmatch[0].rm_so); |
| if (re == &sreg) regfree(re); |
| break; |
| |
| case B_ge: |
| awk_sub(an[0], as[1], getvar_i(av[2]), av[3], res, TRUE); |
| break; |
| |
| case B_gs: |
| setvar_i(res, awk_sub(an[0], as[1], 0, av[2], av[2], FALSE)); |
| break; |
| |
| case B_su: |
| setvar_i(res, awk_sub(an[0], as[1], 1, av[2], av[2], FALSE)); |
| break; |
| } |
| |
| nvfree(tv); |
| return res; |
| } |
| |
| /* |
| * Evaluate node - the heart of the program. Supplied with subtree |
| * and place where to store result. returns ptr to result. |
| */ |
| #define XC(n) ((n) >> 8) |
| |
| static var *evaluate(node *op, var *res) |
| { |
| /* This procedure is recursive so we should count every byte */ |
| static var *fnargs = NULL; |
| static unsigned int seed = 1; |
| static regex_t sreg; |
| node *op1; |
| var *v1; |
| union { |
| var *v; |
| char *s; |
| double d; |
| int i; |
| } L, R; |
| uint32_t opinfo; |
| short opn; |
| union { |
| char *s; |
| rstream *rsm; |
| FILE *F; |
| var *v; |
| regex_t *re; |
| uint32_t info; |
| } X; |
| |
| if (! op) |
| return setvar_s(res, NULL); |
| |
| v1 = nvalloc(2); |
| |
| while (op) { |
| |
| opinfo = op->info; |
| opn = (short)(opinfo & OPNMASK); |
| lineno = op->lineno; |
| |
| /* execute inevitable things */ |
| op1 = op->l.n; |
| if (opinfo & OF_RES1) X.v = L.v = evaluate(op1, v1); |
| if (opinfo & OF_RES2) R.v = evaluate(op->r.n, v1+1); |
| if (opinfo & OF_STR1) L.s = getvar_s(L.v); |
| if (opinfo & OF_STR2) R.s = getvar_s(R.v); |
| if (opinfo & OF_NUM1) L.d = getvar_i(L.v); |
| |
| switch (XC(opinfo & OPCLSMASK)) { |
| |
| /* -- iterative node type -- */ |
| |
| /* test pattern */ |
| case XC( OC_TEST ): |
| if ((op1->info & OPCLSMASK) == OC_COMMA) { |
| /* it's range pattern */ |
| if ((opinfo & OF_CHECKED) || ptest(op1->l.n)) { |
| op->info |= OF_CHECKED; |
| if (ptest(op1->r.n)) |
| op->info &= ~OF_CHECKED; |
| |
| op = op->a.n; |
| } else { |
| op = op->r.n; |
| } |
| } else { |
| op = (ptest(op1)) ? op->a.n : op->r.n; |
| } |
| break; |
| |
| /* just evaluate an expression, also used as unconditional jump */ |
| case XC( OC_EXEC ): |
| break; |
| |
| /* branch, used in if-else and various loops */ |
| case XC( OC_BR ): |
| op = istrue(L.v) ? op->a.n : op->r.n; |
| break; |
| |
| /* initialize for-in loop */ |
| case XC( OC_WALKINIT ): |
| hashwalk_init(L.v, iamarray(R.v)); |
| break; |
| |
| /* get next array item */ |
| case XC( OC_WALKNEXT ): |
| op = hashwalk_next(L.v) ? op->a.n : op->r.n; |
| break; |
| |
| case XC( OC_PRINT ): |
| case XC( OC_PRINTF ): |
| X.F = stdout; |
| if (op->r.n) { |
| X.rsm = newfile(R.s); |
| if (! X.rsm->F) { |
| if (opn == '|') { |
| if((X.rsm->F = popen(R.s, "w")) == NULL) |
| bb_perror_msg_and_die("popen"); |
| X.rsm->is_pipe = 1; |
| } else { |
| X.rsm->F = xfopen(R.s, opn=='w' ? "w" : "a"); |
| } |
| } |
| X.F = X.rsm->F; |
| } |
| |
| if ((opinfo & OPCLSMASK) == OC_PRINT) { |
| if (! op1) { |
| fputs(getvar_s(V[F0]), X.F); |
| } else { |
| while (op1) { |
| L.v = evaluate(nextarg(&op1), v1); |
| if (L.v->type & VF_NUMBER) { |
| fmt_num(buf, MAXVARFMT, getvar_s(V[OFMT]), |
| getvar_i(L.v), TRUE); |
| fputs(buf, X.F); |
| } else { |
| fputs(getvar_s(L.v), X.F); |
| } |
| |
| if (op1) fputs(getvar_s(V[OFS]), X.F); |
| } |
| } |
| fputs(getvar_s(V[ORS]), X.F); |
| |
| } else { /* OC_PRINTF */ |
| L.s = awk_printf(op1); |
| fputs(L.s, X.F); |
| free(L.s); |
| } |
| fflush(X.F); |
| break; |
| |
| case XC( OC_DELETE ): |
| X.info = op1->info & OPCLSMASK; |
| if (X.info == OC_VAR) { |
| R.v = op1->l.v; |
| } else if (X.info == OC_FNARG) { |
| R.v = &fnargs[op1->l.i]; |
| } else { |
| runtime_error(EMSG_NOT_ARRAY); |
| } |
| |
| if (op1->r.n) { |
| clrvar(L.v); |
| L.s = getvar_s(evaluate(op1->r.n, v1)); |
| hash_remove(iamarray(R.v), L.s); |
| } else { |
| clear_array(iamarray(R.v)); |
| } |
| break; |
| |
| case XC( OC_NEWSOURCE ): |
| programname = op->l.s; |
| break; |
| |
| case XC( OC_RETURN ): |
| copyvar(res, L.v); |
| break; |
| |
| case XC( OC_NEXTFILE ): |
| nextfile = TRUE; |
| case XC( OC_NEXT ): |
| nextrec = TRUE; |
| case XC( OC_DONE ): |
| clrvar(res); |
| break; |
| |
| case XC( OC_EXIT ): |
| awk_exit(L.d); |
| |
| /* -- recursive node type -- */ |
| |
| case XC( OC_VAR ): |
| L.v = op->l.v; |
| if (L.v == V[NF]) |
| split_f0(); |
| goto v_cont; |
| |
| case XC( OC_FNARG ): |
| L.v = &fnargs[op->l.i]; |
| |
| v_cont: |
| res = (op->r.n) ? findvar(iamarray(L.v), R.s) : L.v; |
| break; |
| |
| case XC( OC_IN ): |
| setvar_i(res, hash_search(iamarray(R.v), L.s) ? 1 : 0); |
| break; |
| |
| case XC( OC_REGEXP ): |
| op1 = op; |
| L.s = getvar_s(V[F0]); |
| goto re_cont; |
| |
| case XC( OC_MATCH ): |
| op1 = op->r.n; |
| re_cont: |
| X.re = as_regex(op1, &sreg); |
| R.i = regexec(X.re, L.s, 0, NULL, 0); |
| if (X.re == &sreg) regfree(X.re); |
| setvar_i(res, (R.i == 0 ? 1 : 0) ^ (opn == '!' ? 1 : 0)); |
| break; |
| |
| case XC( OC_MOVE ): |
| /* if source is a temporary string, jusk relink it to dest */ |
| if (R.v == v1+1 && R.v->string) { |
| res = setvar_p(L.v, R.v->string); |
| R.v->string = NULL; |
| } else { |
| res = copyvar(L.v, R.v); |
| } |
| break; |
| |
| case XC( OC_TERNARY ): |
| if ((op->r.n->info & OPCLSMASK) != OC_COLON) |
| runtime_error(EMSG_POSSIBLE_ERROR); |
| res = evaluate(istrue(L.v) ? op->r.n->l.n : op->r.n->r.n, res); |
| break; |
| |
| case XC( OC_FUNC ): |
| if (! op->r.f->body.first) |
| runtime_error(EMSG_UNDEF_FUNC); |
| |
| X.v = R.v = nvalloc(op->r.f->nargs+1); |
| while (op1) { |
| L.v = evaluate(nextarg(&op1), v1); |
| copyvar(R.v, L.v); |
| R.v->type |= VF_CHILD; |
| R.v->x.parent = L.v; |
| if (++R.v - X.v >= op->r.f->nargs) |
| break; |
| } |
| |
| R.v = fnargs; |
| fnargs = X.v; |
| |
| L.s = programname; |
| res = evaluate(op->r.f->body.first, res); |
| programname = L.s; |
| |
| nvfree(fnargs); |
| fnargs = R.v; |
| break; |
| |
| case XC( OC_GETLINE ): |
| case XC( OC_PGETLINE ): |
| if (op1) { |
| X.rsm = newfile(L.s); |
| if (! X.rsm->F) { |
| if ((opinfo & OPCLSMASK) == OC_PGETLINE) { |
| X.rsm->F = popen(L.s, "r"); |
| X.rsm->is_pipe = TRUE; |
| } else { |
| X.rsm->F = fopen(L.s, "r"); /* not xfopen! */ |
| } |
| } |
| } else { |
| if (! iF) iF = next_input_file(); |
| X.rsm = iF; |
| } |
| |
| if (! X.rsm->F) { |
| setvar_i(V[ERRNO], errno); |
| setvar_i(res, -1); |
| break; |
| } |
| |
| if (! op->r.n) |
| R.v = V[F0]; |
| |
| L.i = awk_getline(X.rsm, R.v); |
| if (L.i > 0) { |
| if (! op1) { |
| incvar(V[FNR]); |
| incvar(V[NR]); |
| } |
| } |
| setvar_i(res, L.i); |
| break; |
| |
| /* simple builtins */ |
| case XC( OC_FBLTIN ): |
| switch (opn) { |
| |
| case F_in: |
| R.d = (int)L.d; |
| break; |
| |
| case F_rn: |
| R.d = (double)rand() / (double)RAND_MAX; |
| break; |
| |
| #ifdef CONFIG_FEATURE_AWK_MATH |
| case F_co: |
| R.d = cos(L.d); |
| break; |
| |
| case F_ex: |
| R.d = exp(L.d); |
| break; |
| |
| case F_lg: |
| R.d = log(L.d); |
| break; |
| |
| case F_si: |
| R.d = sin(L.d); |
| break; |
| |
| case F_sq: |
| R.d = sqrt(L.d); |
| break; |
| #else |
| case F_co: |
| case F_ex: |
| case F_lg: |
| case F_si: |
| case F_sq: |
| runtime_error(EMSG_NO_MATH); |
| break; |
| #endif |
| |
| case F_sr: |
| R.d = (double)seed; |
| seed = op1 ? (unsigned int)L.d : (unsigned int)time(NULL); |
| srand(seed); |
| break; |
| |
| case F_ti: |
| R.d = time(NULL); |
| break; |
| |
| case F_le: |
| if (! op1) |
| L.s = getvar_s(V[F0]); |
| R.d = strlen(L.s); |
| break; |
| |
| case F_sy: |
| fflush(NULL); |
| R.d = (L.s && *L.s) ? (system(L.s) >> 8) : 0; |
| break; |
| |
| case F_ff: |
| if (! op1) |
| fflush(stdout); |
| else { |
| if (L.s && *L.s) { |
| X.rsm = newfile(L.s); |
| fflush(X.rsm->F); |
| } else { |
| fflush(NULL); |
| } |
| } |
| break; |
| |
| case F_cl: |
| X.rsm = (rstream *)hash_search(fdhash, L.s); |
| if (X.rsm) { |
| R.i = X.rsm->is_pipe ? pclose(X.rsm->F) : fclose(X.rsm->F); |
| free(X.rsm->buffer); |
| hash_remove(fdhash, L.s); |
| } |
| if (R.i != 0) |
| setvar_i(V[ERRNO], errno); |
| R.d = (double)R.i; |
| break; |
| } |
| setvar_i(res, R.d); |
| break; |
| |
| case XC( OC_BUILTIN ): |
| res = exec_builtin(op, res); |
| break; |
| |
| case XC( OC_SPRINTF ): |
| setvar_p(res, awk_printf(op1)); |
| break; |
| |
| case XC( OC_UNARY ): |
| X.v = R.v; |
| L.d = R.d = getvar_i(R.v); |
| switch (opn) { |
| case 'P': |
| L.d = ++R.d; |
| goto r_op_change; |
| case 'p': |
| R.d++; |
| goto r_op_change; |
| case 'M': |
| L.d = --R.d; |
| goto r_op_change; |
| case 'm': |
| R.d--; |
| goto r_op_change; |
| case '!': |
| L.d = istrue(X.v) ? 0 : 1; |
| break; |
| case '-': |
| L.d = -R.d; |
| break; |
| r_op_change: |
| setvar_i(X.v, R.d); |
| } |
| setvar_i(res, L.d); |
| break; |
| |
| case XC( OC_FIELD ): |
| R.i = (int)getvar_i(R.v); |
| if (R.i == 0) { |
| res = V[F0]; |
| } else { |
| split_f0(); |
| if (R.i > nfields) |
| fsrealloc(R.i); |
| |
| res = &Fields[R.i-1]; |
| } |
| break; |
| |
| /* concatenation (" ") and index joining (",") */ |
| case XC( OC_CONCAT ): |
| case XC( OC_COMMA ): |
| opn = strlen(L.s) + strlen(R.s) + 2; |
| X.s = (char *)xmalloc(opn); |
| strcpy(X.s, L.s); |
| if ((opinfo & OPCLSMASK) == OC_COMMA) { |
| L.s = getvar_s(V[SUBSEP]); |
| X.s = (char *)xrealloc(X.s, opn + strlen(L.s)); |
| strcat(X.s, L.s); |
| } |
| strcat(X.s, R.s); |
| setvar_p(res, X.s); |
| break; |
| |
| case XC( OC_LAND ): |
| setvar_i(res, istrue(L.v) ? ptest(op->r.n) : 0); |
| break; |
| |
| case XC( OC_LOR ): |
| setvar_i(res, istrue(L.v) ? 1 : ptest(op->r.n)); |
| break; |
| |
| case XC( OC_BINARY ): |
| case XC( OC_REPLACE ): |
| R.d = getvar_i(R.v); |
| switch (opn) { |
| case '+': |
| L.d += R.d; |
| break; |
| case '-': |
| L.d -= R.d; |
| break; |
| case '*': |
| L.d *= R.d; |
| break; |
| case '/': |
| if (R.d == 0) runtime_error(EMSG_DIV_BY_ZERO); |
| L.d /= R.d; |
| break; |
| case '&': |
| #ifdef CONFIG_FEATURE_AWK_MATH |
| L.d = pow(L.d, R.d); |
| #else |
| runtime_error(EMSG_NO_MATH); |
| #endif |
| break; |
| case '%': |
| if (R.d == 0) runtime_error(EMSG_DIV_BY_ZERO); |
| L.d -= (int)(L.d / R.d) * R.d; |
| break; |
| } |
| res = setvar_i(((opinfo&OPCLSMASK) == OC_BINARY) ? res : X.v, L.d); |
| break; |
| |
| case XC( OC_COMPARE ): |
| if (is_numeric(L.v) && is_numeric(R.v)) { |
| L.d = getvar_i(L.v) - getvar_i(R.v); |
| } else { |
| L.s = getvar_s(L.v); |
| R.s = getvar_s(R.v); |
| L.d = icase ? strcasecmp(L.s, R.s) : strcmp(L.s, R.s); |
| } |
| switch (opn & 0xfe) { |
| case 0: |
| R.i = (L.d > 0); |
| break; |
| case 2: |
| R.i = (L.d >= 0); |
| break; |
| case 4: |
| R.i = (L.d == 0); |
| break; |
| } |
| setvar_i(res, (opn & 0x1 ? R.i : !R.i) ? 1 : 0); |
| break; |
| |
| default: |
| runtime_error(EMSG_POSSIBLE_ERROR); |
| } |
| if ((opinfo & OPCLSMASK) <= SHIFT_TIL_THIS) |
| op = op->a.n; |
| if ((opinfo & OPCLSMASK) >= RECUR_FROM_THIS) |
| break; |
| if (nextrec) |
| break; |
| } |
| nvfree(v1); |
| return res; |
| } |
| |
| |
| /* -------- main & co. -------- */ |
| |
| static int awk_exit(int r) |
| { |
| unsigned int i; |
| hash_item *hi; |
| static var tv; |
| |
| if (! exiting) { |
| exiting = TRUE; |
| nextrec = FALSE; |
| evaluate(endseq.first, &tv); |
| } |
| |
| /* waiting for children */ |
| for (i=0; i<fdhash->csize; i++) { |
| hi = fdhash->items[i]; |
| while(hi) { |
| if (hi->data.rs.F && hi->data.rs.is_pipe) |
| pclose(hi->data.rs.F); |
| hi = hi->next; |
| } |
| } |
| |
| exit(r); |
| } |
| |
| /* if expr looks like "var=value", perform assignment and return 1, |
| * otherwise return 0 */ |
| static int is_assignment(const char *expr) |
| { |
| char *exprc, *s, *s0, *s1; |
| |
| exprc = xstrdup(expr); |
| if (!isalnum_(*exprc) || (s = strchr(exprc, '=')) == NULL) { |
| free(exprc); |
| return FALSE; |
| } |
| |
| *(s++) = '\0'; |
| s0 = s1 = s; |
| while (*s) |
| *(s1++) = nextchar(&s); |
| |
| *s1 = '\0'; |
| setvar_u(newvar(exprc), s0); |
| free(exprc); |
| return TRUE; |
| } |
| |
| /* switch to next input file */ |
| static rstream *next_input_file(void) |
| { |
| static rstream rsm; |
| FILE *F = NULL; |
| char *fname, *ind; |
| static int files_happen = FALSE; |
| |
| if (rsm.F) fclose(rsm.F); |
| rsm.F = NULL; |
| rsm.pos = rsm.adv = 0; |
| |
| do { |
| if (getvar_i(V[ARGIND])+1 >= getvar_i(V[ARGC])) { |
| if (files_happen) |
| return NULL; |
| fname = "-"; |
| F = stdin; |
| } else { |
| ind = getvar_s(incvar(V[ARGIND])); |
| fname = getvar_s(findvar(iamarray(V[ARGV]), ind)); |
| if (fname && *fname && !is_assignment(fname)) |
| F = afopen(fname, "r"); |
| } |
| } while (!F); |
| |
| files_happen = TRUE; |
| setvar_s(V[FILENAME], fname); |
| rsm.F = F; |
| return &rsm; |
| } |
| |
| int awk_main(int argc, char **argv) |
| { |
| unsigned opt; |
| char *opt_F, *opt_v, *opt_W; |
| char *s, *s1; |
| int i, j, c, flen; |
| var *v; |
| static var tv; |
| char **envp; |
| static int from_file = FALSE; |
| rstream *rsm; |
| FILE *F, *stdfiles[3]; |
| static char * stdnames = "/dev/stdin\0/dev/stdout\0/dev/stderr"; |
| |
| /* allocate global buffer */ |
| buf = xmalloc(MAXVARFMT+1); |
| |
| vhash = hash_init(); |
| ahash = hash_init(); |
| fdhash = hash_init(); |
| fnhash = hash_init(); |
| |
| /* initialize variables */ |
| for (i=0; *vNames; i++) { |
| V[i] = v = newvar(nextword(&vNames)); |
| if (*vValues != '\377') |
| setvar_s(v, nextword(&vValues)); |
| else |
| setvar_i(v, 0); |
| |
| if (*vNames == '*') { |
| v->type |= VF_SPECIAL; |
| vNames++; |
| } |
| } |
| |
| handle_special(V[FS]); |
| handle_special(V[RS]); |
| |
| stdfiles[0] = stdin; |
| stdfiles[1] = stdout; |
| stdfiles[2] = stderr; |
| for (i=0; i<3; i++) { |
| rsm = newfile(nextword(&stdnames)); |
| rsm->F = stdfiles[i]; |
| } |
| |
| for (envp=environ; *envp; envp++) { |
| s = xstrdup(*envp); |
| s1 = strchr(s, '='); |
| if (!s1) { |
| goto keep_going; |
| } |
| *(s1++) = '\0'; |
| setvar_u(findvar(iamarray(V[ENVIRON]), s), s1); |
| keep_going: |
| free(s); |
| } |
| |
| opt = getopt32(argc, argv, "F:v:f:W:", &opt_F, &opt_v, &programname, &opt_W); |
| if (opt & 0x1) setvar_s(V[FS], opt_F); // -F |
| if (opt & 0x2) if (!is_assignment(opt_v)) bb_show_usage(); // -v |
| if (opt & 0x4) { // -f |
| from_file = TRUE; |
| F = afopen(programname, "r"); |
| s = NULL; |
| /* one byte is reserved for some trick in next_token */ |
| if (fseek(F, 0, SEEK_END) == 0) { |
| flen = ftell(F); |
| s = (char *)xmalloc(flen+4); |
| fseek(F, 0, SEEK_SET); |
| i = 1 + fread(s+1, 1, flen, F); |
| } else { |
| for (i=j=1; j>0; i+=j) { |
| s = (char *)xrealloc(s, i+4096); |
| j = fread(s+i, 1, 4094, F); |
| } |
| } |
| s[i] = '\0'; |
| fclose(F); |
| parse_program(s+1); |
| free(s); |
| } |
| if (opt & 0x8) // -W |
| bb_error_msg("warning: unrecognized option '-W %s' ignored", opt_W); |
| |
| if (!from_file) { |
| if (argc == optind) |
| bb_show_usage(); |
| programname = "cmd. line"; |
| parse_program(argv[optind++]); |
| |
| } |
| |
| /* fill in ARGV array */ |
| setvar_i(V[ARGC], argc - optind + 1); |
| setari_u(V[ARGV], 0, "awk"); |
| for(i=optind; i < argc; i++) |
| setari_u(V[ARGV], i+1-optind, argv[i]); |
| |
| evaluate(beginseq.first, &tv); |
| if (! mainseq.first && ! endseq.first) |
| awk_exit(EXIT_SUCCESS); |
| |
| /* input file could already be opened in BEGIN block */ |
| if (! iF) iF = next_input_file(); |
| |
| /* passing through input files */ |
| while (iF) { |
| |
| nextfile = FALSE; |
| setvar_i(V[FNR], 0); |
| |
| while ((c = awk_getline(iF, V[F0])) > 0) { |
| |
| nextrec = FALSE; |
| incvar(V[NR]); |
| incvar(V[FNR]); |
| evaluate(mainseq.first, &tv); |
| |
| if (nextfile) |
| break; |
| } |
| |
| if (c < 0) |
| runtime_error(strerror(errno)); |
| |
| iF = next_input_file(); |
| |
| } |
| |
| awk_exit(EXIT_SUCCESS); |
| |
| return 0; |
| } |