sed.c

   1 /*
   2  * Mini sed implementation for busybox
   3  *
   4  *
   5  * Copyright (C) 1999 by Lineo, inc.
   6  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 #include "internal.h"
  25 #include "regexp.h"
  26 #include <stdio.h>
  27 #include <dirent.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <signal.h>
  31 #include <time.h>
  32 #include <ctype.h>
  33
  34 static const char sed_usage[] =
  35 "sed [-n] [-e script] [file...]\n"
  36 "Allowed scripts come in the following form:\n\n"
  37 "'s/regexp/replacement/[gp]'\n"
  38 "\tattempt to match regexp against the pattern space\n"
  39 "\tand if successful replaces the matched portion with replacement.\n\n"
  40 "Options:\n"
  41 "-e\tadd the script to the commands to be executed\n"
  42 "-n\tsuppress automatic printing of pattern space\n\n"
  43 #if defined BB_REGEXP
  44 "This version of sed matches full regexps.\n";
  45 #else
  46 "This version of sed matches strings (not full regexps).\n";
  47 #endif
  48
  49
  50
  51
  52 extern int sed_main (int argc, char **argv)
  53 {
  54     FILE *fp;
  55     char *needle=NULL, *newNeedle=NULL;
  56     char *name;
  57     char *cp;
  58     int ignoreCase=FALSE;
  59     int foundOne=FALSE;
  60     int printFlag=FALSE;
  61     int quietFlag=FALSE;
  62     int stopNow;
  63     char *haystack;
  64
  65     argc--;
  66     argv++;
  67     if (argc < 1) {
  68         usage(sed_usage);
  69     }
  70
  71     if (**argv == '-') {
  72         argc--;
  73         cp = *argv++;
  74         stopNow=FALSE;
  75
  76         while (*++cp && stopNow==FALSE)
  77             switch (*cp) {
  78             case 'n':
  79                 quietFlag = TRUE;
  80                 break;
  81             case 'e':
  82                 if (*(cp+1)==0 && --argc < 0) {
  83                     fprintf(stderr, "A\n");
  84                     usage( sed_usage);
  85                 }
  86                 cp = *argv++;
  87                 while( *cp ) {
  88                     if (*cp == 's' && strlen(cp) > 3 && *(cp+1) == '/') {
  89                         char* pos=needle=cp+2;
  90                         for(;;) {
  91                             pos = strchr(pos, '/');
  92                             if (pos==NULL) {
  93                                 fprintf(stderr, "B\n");
  94                                 usage( sed_usage);
  95                             }
  96                             if (*(pos-1) == '\\') {
  97                                 pos++;
  98                                 continue;
  99                             }
 100                             break;
 101                         }
 102                         *pos=0;
 103                         newNeedle=++pos;
 104                         for(;;) {
 105                             pos = strchr(pos, '/');
 106                             if (pos==NULL) {
 107                                 fprintf(stderr, "C\n");
 108                                 usage( sed_usage);
 109                             }
 110                             if (*(pos-1) == '\\') {
 111                                 pos++;
 112                                 continue;
 113                             }
 114                             break;
 115                         }
 116                         *pos=0;
 117                         if (pos+2 != 0) {
 118                             while (*++pos) {
 119                                 fprintf(stderr, "pos='%s'\n", pos);
 120                                 switch (*pos) {
 121                                     case 'i':
 122                                         ignoreCase=TRUE;
 123                                         break;
 124                                     case 'p':
 125                                         printFlag=TRUE;
 126                                         break;
 127                                     case 'g':
 128                                         break;
 129                                     default:
 130                                         usage( sed_usage);
 131                                 }
 132                             }
 133                         }
 134                     }
 135                     cp++;
 136                 }
 137                 fprintf(stderr, "replace '%s' with '%s'\n", needle, newNeedle);
 138                 stopNow=TRUE;
 139                 break;
 140
 141             default:
 142                 fprintf(stderr, "D\n");
 143                 usage(sed_usage);
 144             }
 145     }
 146
 147     while (argc-- > 0) {
 148         name = *argv++;
 149
 150         fp = fopen (name, "r");
 151         if (fp == NULL) {
 152             perror (name);
 153             continue;
 154         }
 155
 156         haystack = (char*)malloc( 1024);
 157         while (fgets (haystack, 1023, fp)) {
 158
 159             foundOne = replace_match(haystack, needle, newNeedle, ignoreCase);
 160             if (foundOne==TRUE && printFlag==TRUE)
 161                     fputs (haystack, stdout);
 162             if (quietFlag==FALSE)
 163                 fputs (haystack, stdout);
 164             /* Avoid any mem leaks */
 165             free(haystack);
 166             haystack = (char*)malloc( BUF_SIZE);
 167         }
 168
 169         if (ferror (fp))
 170             perror (name);
 171
 172         fclose (fp);
 173     }
 174     exit( TRUE);
 175 }
 176
 177
 178 /* END CODE */
 179
 180