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 "fmt_addr.h"
  10 #include "h/addrsbr.h"
  11 #include "h/fmt_scan.h"
  12 #include "h/utils.h"
  13
  14 static char *buf;               /* our current working buffer  */
  15 static char *bufend;            /* end of working buffer       */
  16 static char *last_dst;          /* buf ptr at end of last call */
  17 static unsigned int bufsiz;     /* current size of buf         */
  18
  19 #define BUFINCR 512             /* how much to expand buf when if fills */
  20
  21 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
  22
  23 /* check if there's enough room in buf for str.  add more mem if needed */
  24 #define CHECKMEM(str) \
  25             if ((len = strlen (str)) >= bufend - dst) {\
  26                 int i = dst - buf;\
  27                 int n = last_dst - buf;\
  28                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
  29                 buf = mh_xrealloc (buf, bufsiz);\
  30                 dst = buf + i;\
  31                 last_dst = buf + n;\
  32                 bufend = buf + bufsiz;\
  33             }
  34
  35
  36 /* fmt_scan will call this routine if the user includes the function
  37  * "(formataddr {component})" in a format string.  "orig" is the
  38  * original contents of the string register.  "str" is the address
  39  * string to be formatted and concatenated onto orig.  This routine
  40  * returns a pointer to the concatenated address string.
  41  *
  42  * We try to not do a lot of malloc/copy/free's (which is why we
  43  * don't call "getcpy") but still place no upper limit on the
  44  * length of the result string.
  45  *
  46  * This routine is placed in a separate library so it can be
  47  * overridden by particular programs (e.g., "replsbr").
  48  */
  49
  50 char *
  51 formataddr (char *orig, char *str)
  52 {
  53     int len;
  54     bool isgroup;
  55     char *dst;
  56     char *cp;
  57     char *sp;
  58     struct mailname *mp = NULL;
  59
  60     /* if we don't have a buffer yet, get one */
  61     if (bufsiz == 0) {
  62         buf = mh_xmalloc (BUFINCR);
  63         last_dst = buf;         /* XXX */
  64         bufsiz = BUFINCR - 6;  /* leave some slop */
  65         bufend = buf + bufsiz;
  66     }
  67     /*
  68      * If "orig" points to our buffer we can just pick up where we
  69      * left off.  Otherwise we have to copy orig into our buffer.
  70      */
  71     if (orig == buf)
  72         dst = last_dst;
  73     else if (!orig || !*orig) {
  74         dst = buf;
  75         *dst = '\0';
  76     } else {
  77         dst = last_dst;         /* XXX */
  78         CHECKMEM (orig);
  79         CPY (orig);
  80     }
  81
  82     /* concatenate all the new addresses onto 'buf' */
  83     for (isgroup = false; (cp = getname (str)); ) {
  84         if ((mp = getm (cp, NULL, 0, NULL, 0)) == NULL)
  85             continue;
  86
  87         if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
  88             *dst++ = ';';
  89             isgroup = false;
  90         }
  91         /* if we get here we're going to add an address */
  92         if (dst != buf) {
  93             *dst++ = ',';
  94             *dst++ = ' ';
  95         }
  96         if (mp->m_gname) {
  97             CHECKMEM (mp->m_gname);
  98             CPY (mp->m_gname);
  99             isgroup = true;
 100         }
 101         sp = adrformat (mp);
 102         CHECKMEM (sp);
 103         CPY (sp);
 104         mnfree (mp);
 105     }
 106
 107     if (isgroup)
 108         *dst++ = ';';
 109
 110     *dst = '\0';
 111     last_dst = dst;
 112     return buf;
 113 }
 114
 115 char *
 116 concataddr (char *orig, char *str)
 117 {
 118     return formataddr(orig, str);
 119 }