fc6f6e933
Marek Polacek
2010-06-22
Subject
rev: new applet
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util-linux/rev.c+121 -0
| @@ -0,0 +1,121 @@ | |
| + | /* |
| + | * rev implementation for busybox |
| + | * |
| + | * Copyright (C) 2010 Marek Polacek <[email protected]> |
| + | * |
| + | * Licensed under GPLv2, see file License in this tarball for details. |
| + | */ |
| + | |
| + | //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); |
| + | } |