| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini tr implementation for busybox |
| * |
| ** Copyright (c) 1987,1997, Prentice Hall All rights reserved. |
| * |
| * The name of Prentice Hall may not be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * Copyright (c) Michiel Huisjes |
| * |
| * This version of tr is adapted from Minix tr and was modified |
| * by Erik Andersen <andersen@codepoet.org> to be used in busybox. |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| /* http://www.opengroup.org/onlinepubs/009695399/utilities/tr.html |
| * TODO: xdigit, graph, print |
| */ |
| #include "libbb.h" |
| |
| #define ASCII 0377 |
| |
| static void map(char *pvector, |
| unsigned char *string1, unsigned int string1_len, |
| unsigned char *string2, unsigned int string2_len) |
| { |
| char last = '0'; |
| unsigned int i, j; |
| |
| for (j = 0, i = 0; i < string1_len; i++) { |
| if (string2_len <= j) |
| pvector[string1[i]] = last; |
| else |
| pvector[string1[i]] = last = string2[j++]; |
| } |
| } |
| |
| /* supported constructs: |
| * Ranges, e.g., 0-9 ==> 0123456789 |
| * Ranges, e.g., [0-9] ==> 0123456789 |
| * Escapes, e.g., \a ==> Control-G |
| * Character classes, e.g. [:upper:] ==> A...Z |
| * Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?) |
| */ |
| static unsigned int expand(const char *arg, char *buffer) |
| { |
| char *buffer_start = buffer; |
| unsigned i; /* can't be unsigned char: must be able to hold 256 */ |
| unsigned char ac; |
| |
| while (*arg) { |
| if (*arg == '\\') { |
| arg++; |
| *buffer++ = bb_process_escape_sequence(&arg); |
| continue; |
| } |
| if (arg[1] == '-') { /* "0-9..." */ |
| ac = arg[2]; |
| if (ac == '\0') { /* "0-": copy verbatim */ |
| *buffer++ = *arg++; /* copy '0' */ |
| continue; /* next iter will copy '-' and stop */ |
| } |
| i = *arg; |
| while (i <= ac) /* ok: i is unsigned _int_ */ |
| *buffer++ = i++; |
| arg += 3; /* skip 0-9 */ |
| continue; |
| } |
| if (*arg == '[') { /* "[xyz..." */ |
| arg++; |
| i = *arg++; |
| /* "[xyz...", i=x, arg points to y */ |
| if (ENABLE_FEATURE_TR_CLASSES && i == ':') { |
| #define CLO ":]\0" |
| static const char classes[] ALIGN1 = |
| "alpha"CLO "alnum"CLO "digit"CLO |
| "lower"CLO "upper"CLO "space"CLO |
| "blank"CLO "punct"CLO "cntrl"CLO; |
| #define CLASS_invalid 0 /* we increment the retval */ |
| #define CLASS_alpha 1 |
| #define CLASS_alnum 2 |
| #define CLASS_digit 3 |
| #define CLASS_lower 4 |
| #define CLASS_upper 5 |
| #define CLASS_space 6 |
| #define CLASS_blank 7 |
| #define CLASS_punct 8 |
| #define CLASS_cntrl 9 |
| //#define CLASS_xdigit 10 |
| //#define CLASS_graph 11 |
| //#define CLASS_print 12 |
| smalluint j; |
| { /* not really pretty.. */ |
| char *tmp = xstrndup(arg, 7); // warning: xdigit would need 8, not 7 |
| j = index_in_strings(classes, tmp) + 1; |
| free(tmp); |
| } |
| if (j == CLASS_alnum || j == CLASS_digit) { |
| for (i = '0'; i <= '9'; i++) |
| *buffer++ = i; |
| } |
| if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_upper) { |
| for (i = 'A'; i <= 'Z'; i++) |
| *buffer++ = i; |
| } |
| if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_lower) { |
| for (i = 'a'; i <= 'z'; i++) |
| *buffer++ = i; |
| } |
| if (j == CLASS_space || j == CLASS_blank) { |
| *buffer++ = '\t'; |
| if (j == CLASS_space) { |
| *buffer++ = '\n'; |
| *buffer++ = '\v'; |
| *buffer++ = '\f'; |
| *buffer++ = '\r'; |
| } |
| *buffer++ = ' '; |
| } |
| if (j == CLASS_punct || j == CLASS_cntrl) { |
| for (i = '\0'; i <= ASCII; i++) |
| if ((j == CLASS_punct && isprint(i) && !isalnum(i) && !isspace(i)) |
| || (j == CLASS_cntrl && iscntrl(i))) |
| *buffer++ = i; |
| } |
| if (j == CLASS_invalid) { |
| *buffer++ = '['; |
| *buffer++ = ':'; |
| continue; |
| } |
| break; |
| } |
| /* "[xyz...", i=x, arg points to y */ |
| if (ENABLE_FEATURE_TR_EQUIV && i == '=') { /* [=CHAR=] */ |
| *buffer++ = *arg; /* copy CHAR */ |
| arg += 3; /* skip CHAR=] */ |
| continue; |
| } |
| if (*arg != '-') { /* not [x-...] - copy verbatim */ |
| *buffer++ = '['; |
| arg--; /* points to x */ |
| continue; /* copy all, including eventual ']' */ |
| } |
| /* [x-y...] */ |
| arg++; |
| ac = *arg++; |
| while (i <= ac) |
| *buffer++ = i++; |
| arg++; /* skip the assumed ']' */ |
| continue; |
| } |
| *buffer++ = *arg++; |
| } |
| return (buffer - buffer_start); |
| } |
| |
| static int complement(char *buffer, int buffer_len) |
| { |
| int i, j, ix; |
| char conv[ASCII + 2]; |
| |
| ix = 0; |
| for (i = '\0'; i <= ASCII; i++) { |
| for (j = 0; j < buffer_len; j++) |
| if (buffer[j] == i) |
| break; |
| if (j == buffer_len) |
| conv[ix++] = i & ASCII; |
| } |
| memcpy(buffer, conv, ix); |
| return ix; |
| } |
| |
| int tr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int tr_main(int argc UNUSED_PARAM, char **argv) |
| { |
| int output_length = 0, input_length; |
| int i; |
| smalluint flags; |
| ssize_t read_chars = 0; |
| size_t in_index = 0, out_index = 0; |
| unsigned last = UCHAR_MAX + 1; /* not equal to any char */ |
| unsigned char coded, c; |
| unsigned char *output = xmalloc(BUFSIZ); |
| char *vector = xzalloc((ASCII+1) * 3); |
| char *invec = vector + (ASCII+1); |
| char *outvec = vector + (ASCII+1) * 2; |
| |
| #define TR_OPT_complement (1 << 0) |
| #define TR_OPT_delete (1 << 1) |
| #define TR_OPT_squeeze_reps (1 << 2) |
| |
| flags = getopt32(argv, "+cds"); /* '+': stop at first non-option */ |
| argv += optind; |
| |
| for (i = 0; i <= ASCII; i++) { |
| vector[i] = i; |
| /*invec[i] = outvec[i] = FALSE; - done by xzalloc */ |
| } |
| |
| #define tr_buf bb_common_bufsiz1 |
| if (*argv != NULL) { |
| input_length = expand(*argv++, tr_buf); |
| if (flags & TR_OPT_complement) |
| input_length = complement(tr_buf, input_length); |
| if (*argv) { |
| if (argv[0][0] == '\0') |
| bb_error_msg_and_die("STRING2 cannot be empty"); |
| output_length = expand(*argv, (char *)output); |
| map(vector, (unsigned char *)tr_buf, input_length, output, output_length); |
| } |
| for (i = 0; i < input_length; i++) |
| invec[(unsigned char)tr_buf[i]] = TRUE; |
| for (i = 0; i < output_length; i++) |
| outvec[output[i]] = TRUE; |
| } |
| |
| for (;;) { |
| /* If we're out of input, flush output and read more input. */ |
| if ((ssize_t)in_index == read_chars) { |
| if (out_index) { |
| xwrite(STDOUT_FILENO, (char *)output, out_index); |
| out_index = 0; |
| } |
| read_chars = safe_read(STDIN_FILENO, tr_buf, BUFSIZ); |
| if (read_chars <= 0) { |
| if (read_chars < 0) |
| bb_perror_msg_and_die(bb_msg_read_error); |
| exit(EXIT_SUCCESS); |
| } |
| in_index = 0; |
| } |
| c = tr_buf[in_index++]; |
| coded = vector[c]; |
| if ((flags & TR_OPT_delete) && invec[c]) |
| continue; |
| if ((flags & TR_OPT_squeeze_reps) && last == coded |
| && (invec[c] || outvec[coded])) |
| continue; |
| output[out_index++] = last = coded; |
| } |
| /* NOTREACHED */ |
| return EXIT_SUCCESS; |
| } |