distrib/msw/unix2dos.c

   1 /*****************************************************************************
   2 dos2unix, unix2dos: translate unix <-> dos text files by
   3                        -> adding a CR before each LF
   4                        <- removing the CR from CRLF pairs
   5
   6 Use a modern compiler (gcc);  name the executable either unix2dos or dos2unix,
   7 and link to the other name. A warning will be printed if the input of unix2dos
   8 contains CR's, as it may have already been a dos file (output still produced).
   9 The warning is not produced if input is stdin.
  10 Jim Martino                                     +++++++++++++++++++++++++++++
  11 jrm@chow.mat.jhu.edu                    +   PLACE COMMERCIAL HERE   +
  12 jmartino@jhunix.hcf.jhu.edu             +++++++++++++++++++++++++++++
  13 Modified by Julian Smart, September 2002
  14 *****************************************************************************/
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19
  20 #define CR '\015'  /* define CR character */
  21 #define LF '\012'  /* define LF character */
  22
  23 char *prog;      /* global var: program name as called */
  24 int warning=0;   /* global var: flag for unix2dos if input has CR's */
  25
  26 void usage();
  27 void translate(FILE *, FILE *, int unix2Dos);
  28
  29 main(int argc, char *argv[])
  30 {
  31     FILE *fp, *outFile;
  32     int i;
  33     int unix2Dos;
  34
  35     prog = argv[0]; /* program name as called */
  36
  37     unix2Dos = 1;
  38
  39     i = 1;
  40     if (argc > 1)
  41     {
  42         if (strcmp(argv[1], "--help") == 0)
  43         {
  44             usage();
  45         }
  46         else if (strcmp(argv[1], "--dos2unix") == 0)
  47         {
  48             unix2Dos = 0;
  49         }
  50         else if (strcmp(argv[1], "--unix2dos") == 0)
  51         {
  52             unix2Dos = 1;
  53         }
  54         else
  55         {
  56             usage();
  57         }
  58     }
  59     else
  60         usage();
  61
  62     i ++;
  63     if (i == argc)
  64         translate(stdin, stdout, unix2Dos);
  65     else
  66     {
  67         while (i < argc)
  68         {
  69             char tmpFile[512];
  70             sprintf(tmpFile, "%s.tmp", argv[i]);
  71
  72             fp = fopen(argv[i], "rb");
  73             if (!fp)
  74             {
  75                 fprintf(stderr, "Cannot open %s.\n", argv[i]);
  76                 i ++;
  77                 continue;
  78             }
  79             outFile = fopen(tmpFile, "wb");
  80             if (!outFile)
  81             {
  82                 fprintf(stderr, "Cannot open %s.\n", tmpFile);
  83                 exit(1);
  84             }
  85             translate(fp, outFile, unix2Dos);
  86
  87             if (warning) /* unix2dos acting on a possible DOS file */
  88             {
  89                 fprintf(stderr,"%s: %s may have already been in DOS format. Not converted.\n",
  90                         prog, argv[i]);
  91                 warning = 0;
  92             }
  93             fclose(fp);
  94             fclose(outFile);
  95 #ifdef _WINDOWS
  96             remove(argv[i]);
  97 #else
  98             unlink(argv[i]);
  99 #endif
 100             rename(tmpFile, argv[i]);
 101
 102             i ++;
 103         }
 104     }
 105 }
 106
 107 /* translate: unix2dos-change LF to CRLF
 108 dos2unix-strip out CR only before LF */
 109
 110 void translate(FILE *ifp, FILE *ofp, int unix2Dos)
 111 {
 112     int c,d;
 113
 114     if (!unix2Dos)
 115     {
 116         /* DOS2Unix */
 117         while ((c = getc(ifp)) != EOF)
 118         {
 119             if (c == CR)
 120             {
 121                 switch(d = getc(ifp))
 122                 { /* check to see if LF follows */
 123                     case LF:
 124                         putc(d,ofp);         /* if so, ignore CR */
 125                         break;
 126                     default:
 127                         putc(c,ofp);         /* if not, output CR and following char */
 128                         putc(d,ofp);
 129                 }
 130             }
 131             else
 132                 putc(c, ofp); /* c is not a CR */
 133         }
 134      }
 135      else
 136         {
 137             /* Unix2DOS */
 138             while ((c = getc(ifp)) != EOF){
 139                 if (c == CR)
 140                     warning = 1;   /* set warning flag: input file may be a DOS file */
 141                 if (c == LF && (warning == 0))
 142                     putc(CR, ofp); /* add CR before each LF */
 143                 putc(c, ofp);
 144             }
 145         }
 146 }
 147
 148 void usage()
 149 {
 150     fprintf(stderr, "Usage:\n%s [--dos2unix] [--unix2dos] file1 file2 ...\nor\n%s [--dos2unix] [--unix2dos] < infile > outfile\n", prog, prog);
 151     exit(0);
 152 }