mdw@git.distorted.org.uk Git - ezmlm/blob - concatHDR.c

   1 /*$Id: */
   2 /*$Name: ezmlm-idx-040 $*/
   3
   4 #include "stralloc.h"
   5 #include "strerr.h"
   6 #include "case.h"
   7 #include "byte.h"
   8 #include "mime.h"
   9 #include "errtxt.h"
  10
  11 void concatHDR(indata,n,outdata,fatal)
  12 char *indata;
  13 unsigned int n;
  14 stralloc *outdata;
  15 char *fatal;
  16 /* takes a concatenated string of line and continuation line, trims leading */
  17 /* and trailing LWSP and collapses line breaks and surrounding LWSP to ' '. */
  18 /* indata has to end in \n or \0 or this routine will write beyond indata!  */
  19 /* if indata ends with \0, this will be changed to \n. */
  20
  21 {
  22   register char *cp,*cpout;
  23   char *cplast;
  24   if (!stralloc_copys(outdata,"")) die_nomem(fatal);
  25   if (!stralloc_ready(outdata,n)) die_nomem(fatal);
  26   cpout = outdata->s;
  27   if (n == 0) return;
  28   cplast = indata + n - 1;
  29   cp = cplast;
  30   while (*cplast == '\0' || *cplast == '\n') --cplast;
  31   if (cp == cplast) die_nomem(fatal);           /* just in case */
  32   *(++cplast) = '\n';                           /* have terminal '\n' */
  33   cp = indata;
  34   while (cp <= cplast) {
  35     while (*cp == ' ' || *cp == '\t') ++cp;     /* LWSP before */
  36     while (*cp != '\n') *(cpout++) = *(cp++);   /* text */
  37     ++cp;                                       /* skip \n */
  38     --cpout;                                    /* last char */
  39     while (*cpout == ' ' || *cpout == '\t') --cpout;    /* LWSP after */
  40     *(++cpout) = ' ';                           /* replace with single ' ' */
  41     ++cpout;                                    /* point to free byte */
  42   }
  43   outdata->len = cpout - outdata->s;
  44 }
  45