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     free (formats);
  61     formats = 0;
  62 }
  63
  64
  65 /*
  66  * Expand escapes in format strings
  67  */
  68
  69 static void
  70 normalize (char *cp)
  71 {
  72     char *dp;
  73
  74     for (dp = cp; *cp; cp++) {
  75         if (*cp != QUOTE) {
  76             *dp++ = *cp;
  77         } else {
  78             switch (*++cp) {
  79                 case 'b':
  80                     *dp++ = '\b';
  81                     break;
  82
  83                 case 'f':
  84                     *dp++ = '\f';
  85                     break;
  86
  87                 case 'n':
  88                     *dp++ = '\n';
  89                     break;
  90
  91                 case 'r':
  92                     *dp++ = '\r';
  93                     break;
  94
  95                 case 't':
  96                     *dp++ = '\t';
  97                     break;
  98
  99                 case '\n':
 100                     break;
 101
 102                 case 0:
 103                     cp--;
 104                     /* FALLTHRU */
 105                 default:
 106                     *dp++ = *cp;
 107                     break;
 108             }
 109         }
 110     }
 111     *dp = '\0';
 112 }