concat_hdr.c

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#include "stralloc.h"
#include "case.h"
#include "byte.h"
#include "mime.h"
#include "errtxt.h"
#include "idx.h"
#include "logmsg.h"
#include "errtxt.h"
 
#define WHO "concat_hdr"

 
static void die_nomem() { logmsg(WHO,111,FATAL,ERR_NOMEM); }
 
void concat_hdr(char *indata,unsigned int n,stralloc *outdata)
{
  char *cp;
  char *cpout;
  char *cplast;
 
  if (!stralloc_copys(outdata,"")) die_nomem();
  if (!stralloc_ready(outdata,n)) die_nomem();
 
  cpout = outdata->s;
  if (n == 0) return;
 
  cplast = indata + n - 1;
  cp = cplast;
 
  while (*cplast == '\0' || *cplast == '\n') 
    --cplast;
  if (cp == cplast) die_nomem();                          /* just in case */
  *(++cplast) = '\n';                                                /* have terminal '\n' */
  cp = indata;
 
  while (cp <= cplast) {
    while (*cp == ' ' || *cp == '\t') ++cp;            /* LWSP before */
    while (*cp != '\n') *(cpout++) = *(cp++);          /* text */
    ++cp;                                                                    /* skip \n */ 
    --cpout;                                                               /* last char */
    while (*cpout == ' ' || *cpout == '\t') 
      --cpout;                                   /* LWSP after */
    *(++cpout) = ' ';                                                /* replace with single ' ' */
    ++cpout;                                                               /* point to free byte */
  }
  outdata->len = cpout - outdata->s;
}