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

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