| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini sed implementation for busybox |
| * |
| * |
| * Copyright (C) 1999,2000 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> |
| * |
| * Modifications for addresses and append command have been |
| * written by Marco Pantaleoni <panta@prosa.it>, <panta@elasticworld.org> |
| * and are: |
| * Copyright (C) 1999 Marco Pantaleoni. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include "internal.h" |
| #include "regexp.h" |
| #include <stdio.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <time.h> |
| #include <ctype.h> |
| |
| static const char sed_usage[] = |
| "sed [-n] -e script [file...]\n" |
| #ifndef BB_FEATURE_TRIVIAL_HELP |
| "\nAllowed sed scripts come in the following form:\n" |
| "\t'ADDR [!] COMMAND'\n\n" |
| "\twhere address ADDR can be:\n" |
| "\t NUMBER Match specified line number\n" |
| "\t $ Match last line\n" |
| "\t /REGEXP/ Match specified regexp\n" |
| "\t (! inverts the meaning of the match)\n\n" |
| "\tand COMMAND can be:\n" |
| "\t s/regexp/replacement/[igp]\n" |
| "\t which attempt to match regexp against the pattern space\n" |
| "\t and if successful replaces the matched portion with replacement.\n\n" |
| "\t aTEXT\n" |
| "\t which appends TEXT after the pattern space\n" |
| "Options:\n" |
| "-e\tadd the script to the commands to be executed\n" |
| "-n\tsuppress automatic printing of pattern space\n\n" |
| #if defined BB_REGEXP |
| "This version of sed matches full regular expressions.\n"; |
| #else |
| "This version of sed matches strings (not full regular expressions).\n" |
| #endif |
| #endif |
| ; |
| |
| /* Flags & variables */ |
| |
| typedef enum { f_none, f_replace, f_append } sed_function; |
| |
| #define NO_LINE -2 |
| #define LAST_LINE -1 |
| static int addr_line = NO_LINE; |
| static char *addr_pattern = NULL; |
| static int negated = 0; |
| |
| #define SKIPSPACES(p) do { while (isspace(*(p))) (p)++; } while (0) |
| |
| #define BUFSIZE 1024 |
| |
| static inline int at_last(FILE * fp) |
| { |
| int res = 0; |
| |
| if (feof(fp)) |
| return 1; |
| else { |
| int ch; |
| |
| if ((ch = fgetc(fp)) == EOF) |
| res++; |
| ungetc(ch, fp); |
| } |
| return res; |
| } |
| |
| static void do_sed_repl(FILE * fp, char *needle, char *newNeedle, |
| int ignoreCase, int printFlag, int quietFlag) |
| { |
| int foundOne = FALSE; |
| char haystack[BUFSIZE]; |
| int line = 1, doit; |
| |
| while (fgets(haystack, BUFSIZE - 1, fp)) { |
| doit = 0; |
| if (addr_pattern) { |
| doit = !find_match(haystack, addr_pattern, FALSE); |
| } else if (addr_line == NO_LINE) |
| doit = 1; |
| else if (addr_line == LAST_LINE) { |
| if (at_last(fp)) |
| doit = 1; |
| } else { |
| if (line == addr_line) |
| doit = 1; |
| } |
| if (negated) |
| doit = 1 - doit; |
| if (doit) { |
| foundOne = |
| replace_match(haystack, needle, newNeedle, ignoreCase); |
| |
| if (foundOne == TRUE && printFlag == TRUE) { |
| fprintf(stdout, haystack); |
| } |
| } |
| |
| if (quietFlag == FALSE) { |
| fprintf(stdout, haystack); |
| } |
| |
| line++; |
| } |
| } |
| |
| static void do_sed_append(FILE * fp, char *appendline, int quietFlag) |
| { |
| char buffer[BUFSIZE]; |
| int line = 1, doit; |
| |
| while (fgets(buffer, BUFSIZE - 1, fp)) { |
| doit = 0; |
| if (addr_pattern) { |
| doit = !find_match(buffer, addr_pattern, FALSE); |
| } else if (addr_line == NO_LINE) |
| doit = 1; |
| else if (addr_line == LAST_LINE) { |
| if (at_last(fp)) |
| doit = 1; |
| } else { |
| if (line == addr_line) |
| doit = 1; |
| } |
| if (negated) |
| doit = 1 - doit; |
| if (quietFlag == FALSE) { |
| fprintf(stdout, buffer); |
| } |
| if (doit) { |
| fputs(appendline, stdout); |
| fputc('\n', stdout); |
| } |
| |
| line++; |
| } |
| } |
| |
| extern int sed_main(int argc, char **argv) |
| { |
| FILE *fp; |
| char *needle = NULL, *newNeedle = NULL; |
| char *name; |
| char *cp; |
| int ignoreCase = FALSE; |
| int printFlag = FALSE; |
| int quietFlag = FALSE; |
| int stopNow; |
| char *line_s = NULL, saved; |
| char *appendline = NULL; |
| char *pos; |
| sed_function sed_f = f_none; |
| |
| argc--; |
| argv++; |
| if (argc < 1) { |
| usage(sed_usage); |
| } |
| |
| while (argc > 1) { |
| if (**argv != '-') |
| usage(sed_usage); |
| argc--; |
| cp = *argv++; |
| stopNow = FALSE; |
| |
| while (*++cp && stopNow == FALSE) { |
| switch (*cp) { |
| case 'n': |
| quietFlag = TRUE; |
| break; |
| case 'e': |
| if (*(cp + 1) == 0 && --argc < 0) { |
| usage(sed_usage); |
| } |
| if (*++cp != 's') |
| cp = *argv++; |
| |
| /* Read address if present */ |
| SKIPSPACES(cp); |
| if (*cp == '$') { |
| addr_line = LAST_LINE; |
| cp++; |
| } else { |
| if (isdigit(*cp)) { /* LINE ADDRESS */ |
| line_s = cp; |
| while (isdigit(*cp)) |
| cp++; |
| if (cp > line_s) { |
| /* numeric line */ |
| saved = *cp; |
| *cp = '\0'; |
| addr_line = atoi(line_s); |
| *cp = saved; |
| } |
| } else if (*cp == '/') { /* PATTERN ADDRESS */ |
| pos = addr_pattern = cp + 1; |
| pos = strchr(pos, '/'); |
| if (!pos) |
| usage(sed_usage); |
| *pos = '\0'; |
| cp = pos + 1; |
| } |
| } |
| |
| SKIPSPACES(cp); |
| if (*cp == '!') { |
| negated++; |
| cp++; |
| } |
| |
| /* Read command */ |
| |
| SKIPSPACES(cp); |
| switch (*cp) { |
| case 's': /* REPLACE */ |
| if (strlen(cp) <= 3 || *(cp + 1) != '/') |
| break; |
| sed_f = f_replace; |
| |
| pos = needle = cp + 2; |
| |
| for (;;) { |
| pos = strchr(pos, '/'); |
| if (pos == NULL) { |
| usage(sed_usage); |
| } |
| if (*(pos - 1) == '\\') { |
| pos++; |
| continue; |
| } |
| break; |
| } |
| *pos = 0; |
| newNeedle = ++pos; |
| for (;;) { |
| pos = strchr(pos, '/'); |
| if (pos == NULL) { |
| usage(sed_usage); |
| } |
| if (*(pos - 1) == '\\') { |
| pos++; |
| continue; |
| } |
| break; |
| } |
| *pos = 0; |
| if (pos + 2 != 0) { |
| while (*++pos) { |
| switch (*pos) { |
| case 'i': |
| ignoreCase = TRUE; |
| break; |
| case 'p': |
| printFlag = TRUE; |
| break; |
| case 'g': |
| break; |
| default: |
| usage(sed_usage); |
| } |
| } |
| } |
| cp = pos; |
| /* fprintf(stderr, "replace '%s' with '%s'\n", needle, newNeedle); */ |
| break; |
| |
| case 'a': /* APPEND */ |
| if (strlen(cp) < 2) |
| break; |
| sed_f = f_append; |
| appendline = ++cp; |
| /* fprintf(stderr, "append '%s'\n", appendline); */ |
| break; |
| } |
| |
| stopNow = TRUE; |
| break; |
| |
| default: |
| usage(sed_usage); |
| } |
| } |
| } |
| |
| if (argc == 0) { |
| switch (sed_f) { |
| case f_none: |
| break; |
| case f_replace: |
| do_sed_repl(stdin, needle, newNeedle, ignoreCase, printFlag, |
| quietFlag); |
| break; |
| case f_append: |
| do_sed_append(stdin, appendline, quietFlag); |
| break; |
| } |
| } else { |
| while (argc-- > 0) { |
| name = *argv++; |
| |
| fp = fopen(name, "r"); |
| if (fp == NULL) { |
| perror(name); |
| continue; |
| } |
| |
| switch (sed_f) { |
| case f_none: |
| break; |
| case f_replace: |
| do_sed_repl(fp, needle, newNeedle, ignoreCase, printFlag, |
| quietFlag); |
| break; |
| case f_append: |
| do_sed_append(fp, appendline, quietFlag); |
| break; |
| } |
| |
| if (ferror(fp)) |
| perror(name); |
| |
| fclose(fp); |
| } |
| } |
| return(TRUE); |
| } |
| |
| |
| /* END CODE */ |
