| /* |
| * rev implementation for busybox |
| * |
| * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| |
| //applet:IF_REV(APPLET(rev, _BB_DIR_BIN, _BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_REV) += rev.o |
| |
| //config:config REV |
| //config: bool "rev" |
| //config: default y |
| //config: help |
| //config: Reverse lines of a file or files. |
| |
| //usage:#define rev_trivial_usage |
| //usage: "[FILE]..." |
| //usage:#define rev_full_usage "\n\n" |
| //usage: "Reverse lines of FILE" |
| |
| #include "libbb.h" |
| #include "unicode.h" |
| |
| #undef CHAR_T |
| #if ENABLE_UNICODE_SUPPORT |
| # define CHAR_T wchar_t |
| #else |
| # define CHAR_T char |
| #endif |
| |
| /* In-place invert */ |
| static void strrev(CHAR_T *s, int len) |
| { |
| int i; |
| |
| if (len != 0) { |
| len--; |
| if (len != 0 && s[len] == '\n') |
| len--; |
| } |
| |
| for (i = 0; i < len; i++, len--) { |
| CHAR_T c = s[i]; |
| s[i] = s[len]; |
| s[len] = c; |
| } |
| } |
| |
| int rev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int rev_main(int argc UNUSED_PARAM, char **argv) |
| { |
| int retval; |
| size_t bufsize; |
| char *buf; |
| |
| init_unicode(); |
| |
| getopt32(argv, ""); |
| argv += optind; |
| if (!argv[0]) |
| argv = (char **)&bb_argv_dash; |
| |
| retval = EXIT_SUCCESS; |
| bufsize = 256; |
| buf = xmalloc(bufsize); |
| do { |
| size_t pos; |
| FILE *fp; |
| |
| fp = fopen_or_warn_stdin(*argv++); |
| if (!fp) { |
| retval = EXIT_FAILURE; |
| continue; |
| } |
| |
| pos = 0; |
| while (1) { |
| /* Read one line */ |
| buf[bufsize - 1] = 1; /* not 0 */ |
| if (!fgets(buf + pos, bufsize - pos, fp)) |
| break; /* EOF/error */ |
| if (buf[bufsize - 1] == '\0' /* fgets filled entire buffer */ |
| && buf[bufsize - 2] != '\n' /* and did not read '\n' */ |
| && !feof(fp) |
| ) { |
| /* Line is too long, extend buffer */ |
| pos = bufsize - 1; |
| bufsize += 64 + bufsize / 8; |
| buf = xrealloc(buf, bufsize); |
| continue; |
| } |
| |
| /* Process and print it */ |
| #if ENABLE_UNICODE_SUPPORT |
| { |
| wchar_t *tmp = xmalloc(bufsize * sizeof(wchar_t)); |
| /* Convert to wchar_t (might error out!) */ |
| int len = mbstowcs(tmp, buf, bufsize); |
| if (len >= 0) { |
| strrev(tmp, len); |
| /* Convert back to char */ |
| wcstombs(buf, tmp, bufsize); |
| } |
| free(tmp); |
| } |
| #else |
| strrev(buf, strlen(buf)); |
| #endif |
| fputs(buf, stdout); |
| } |
| fclose(fp); |
| } while (*argv); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(buf); |
| |
| fflush_stdout_and_exit(retval); |
| } |