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

   1 /* fmt_addr.c -- format an address field (from fmt_scan)
   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/addrsbr.h>
  10 #include <h/fmt_scan.h>
  11 #include <h/utils.h>
  12
  13 static char *buf;               /* our current working buffer  */
  14 static char *bufend;            /* end of working buffer       */
  15 static char *last_dst;          /* buf ptr at end of last call */
  16 static unsigned int bufsiz;     /* current size of buf         */
  17
  18 #define BUFINCR 512             /* how much to expand buf when if fills */
  19
  20 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
  21
  22 /* check if there's enough room in buf for str.  add more mem if needed */
  23 #define CHECKMEM(str) \
  24             if ((len = strlen (str)) >= bufend - dst) {\
  25                 int i = dst - buf;\
  26                 int n = last_dst - buf;\
  27                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
  28                 buf = mh_xrealloc (buf, bufsiz);\
  29                 dst = buf + i;\
  30                 last_dst = buf + n;\
  31                 bufend = buf + bufsiz;\
  32             }
  33
  34
  35 /* fmt_scan will call this routine if the user includes the function
  36  * "(formataddr {component})" in a format string.  "orig" is the
  37  * original contents of the string register.  "str" is the address
  38  * string to be formatted and concatenated onto orig.  This routine
  39  * returns a pointer to the concatenated address string.
  40  *
  41  * We try to not do a lot of malloc/copy/free's (which is why we
  42  * don't call "getcpy") but still place no upper limit on the
  43  * length of the result string.
  44  *
  45  * This routine is placed in a separate library so it can be
  46  * overridden by particular programs (e.g., "replsbr").
  47  */
  48
  49 char *
  50 formataddr (char *orig, char *str)
  51 {
  52     int len;
  53     int isgroup;
  54     char *dst;
  55     char *cp;
  56     char *sp;
  57     struct mailname *mp = NULL;
  58
  59     /* if we don't have a buffer yet, get one */
  60     if (bufsiz == 0) {
  61         buf = mh_xmalloc (BUFINCR);
  62         last_dst = buf;         /* XXX */
  63         bufsiz = BUFINCR - 6;  /* leave some slop */
  64         bufend = buf + bufsiz;
  65     }
  66     /*
  67      * If "orig" points to our buffer we can just pick up where we
  68      * left off.  Otherwise we have to copy orig into our buffer.
  69      */
  70     if (orig == buf)
  71         dst = last_dst;
  72     else if (!orig || !*orig) {
  73         dst = buf;
  74         *dst = '\0';
  75     } else {
  76         dst = last_dst;         /* XXX */
  77         CHECKMEM (orig);
  78         CPY (orig);
  79     }
  80
  81     /* concatenate all the new addresses onto 'buf' */
  82     for (isgroup = 0; (cp = getname (str)); ) {
  83         if ((mp = getm (cp, NULL, 0, NULL, 0)) == NULL)
  84             continue;
  85
  86         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
  87             *dst++ = ';';
  88             isgroup = 0;
  89         }
  90         /* if we get here we're going to add an address */
  91         if (dst != buf) {
  92             *dst++ = ',';
  93             *dst++ = ' ';
  94         }
  95         if (mp->m_gname) {
  96             CHECKMEM (mp->m_gname);
  97             CPY (mp->m_gname);
  98             isgroup++;
  99         }
 100         sp = adrformat (mp);
 101         CHECKMEM (sp);
 102         CPY (sp);
 103         mnfree (mp);
 104     }
 105
 106     if (isgroup)
 107         *dst++ = ';';
 108
 109     *dst = '\0';
 110     last_dst = dst;
 111     return buf;
 112 }
 113
 114 char *concataddr (char *orig, char *str)
 115 {
 116     return formataddr(orig, str);
 117 }