diplodocus.org Git - nmh/blob - sbr/fmt_new.c

   1 /* fmt_new.c -- read format file/string and normalize
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9 #include <h/utils.h>
  10
  11 #define QUOTE '\\'
  12
  13 static char *formats = 0;
  14
  15 /*
  16  * static prototypes
  17  */
  18 static void normalize (char *);
  19
  20
  21 /*
  22  * Get new format string
  23  */
  24
  25 char *
  26 new_fs (char *form, char *format, char *default_fs)
  27 {
  28     struct stat st;
  29     FILE *fp;
  30
  31     free(formats);
  32
  33     if (form) {
  34         if ((fp = fopen (etcpath (form), "r")) == NULL)
  35             adios (form, "unable to open format file");
  36
  37         if (fstat (fileno (fp), &st) == -1)
  38             adios (form, "unable to stat format file");
  39
  40         formats = mh_xmalloc ((size_t) st.st_size + 1);
  41
  42         if (read (fileno(fp), formats, (int) st.st_size) != st.st_size)
  43             adios (form, "error reading format file");
  44
  45         formats[st.st_size] = '\0';
  46
  47         fclose (fp);
  48     } else {
  49         formats = getcpy (format ? format : default_fs);
  50     }
  51
  52     normalize (formats);        /* expand escapes */
  53
  54     return formats;
  55 }
  56
  57
  58 void
  59 free_fs(void)
  60 {
  61     free (formats);
  62     formats = 0;
  63 }
  64
  65
  66 /*
  67  * Expand escapes in format strings
  68  */
  69
  70 static void
  71 normalize (char *cp)
  72 {
  73     char *dp;
  74
  75     for (dp = cp; *cp; cp++) {
  76         if (*cp != QUOTE) {
  77             *dp++ = *cp;
  78         } else {
  79             switch (*++cp) {
  80                 case 'b':
  81                     *dp++ = '\b';
  82                     break;
  83
  84                 case 'f':
  85                     *dp++ = '\f';
  86                     break;
  87
  88                 case 'n':
  89                     *dp++ = '\n';
  90                     break;
  91
  92                 case 'r':
  93                     *dp++ = '\r';
  94                     break;
  95
  96                 case 't':
  97                     *dp++ = '\t';
  98                     break;
  99
 100                 case '\n':
 101                     break;
 102
 103                 case 0:
 104                     cp--;
 105                     /* FALLTHRU */
 106                 default:
 107                     *dp++ = *cp;
 108                     break;
 109             }
 110         }
 111     }
 112     *dp = '\0';
 113 }