headerbody.c

linux下qmail的源码 本人加了一些注释

#include "stralloc.h"
#include "substdio.h"
#include "getln.h"
#include "hfield.h"
#include "headerbody.h"

static int getsa(ss,sa,match)
substdio *ss;
stralloc *sa;
int *match;
{
 if (!*match) return 0;
 if (getln(ss,sa,match,'\n') == -1) return -1;
 if (*match) return 1;
 if (!sa->len) return 0;
 if (!stralloc_append(sa,"\n")) return -1;
 return 1;
}

static stralloc line = {0};
static stralloc nextline = {0};

int headerbody(ss,dohf,hdone,dobl)
substdio *ss;
void (*dohf)();
void (*hdone)();
void (*dobl)();
{
 int match;
 int flaglineok;
 match = 1;
 flaglineok = 0;
 for (;;)
  {
   switch(getsa(ss,&nextline,&match))
    {
     case -1:
       return -1;
     case 0:
       if (flaglineok) dohf(&line);
       hdone();
       /* no message body; could insert blank line here */
       return 0;
    }
   if (flaglineok)
    {
     if ((nextline.s[0] == ' ') || (nextline.s[0] == '\t'))
      {
       if (!stralloc_cat(&line,&nextline)) return -1;
       continue;
      }
     dohf(&line);
    }
   if (nextline.len == 1)
    {
     hdone();
     dobl(&nextline);
     break;
    }
   if (stralloc_starts(&nextline,"From "))
    {
     if (!stralloc_copys(&line,"MBOX-Line: ")) return -1;
     if (!stralloc_cat(&line,&nextline)) return -1;
    }
   else
     if (hfield_valid(nextline.s,nextline.len))
      {
       if (!stralloc_copy(&line,&nextline)) return -1;
      }
     else
      {
       hdone();
       if (!stralloc_copys(&line,"\n")) return -1;
       dobl(&line);
       dobl(&nextline);
       break;
      }
   flaglineok = 1;
  }
 for (;;)
   switch(getsa(ss,&nextline,&match))
    {
     case -1: return -1;
     case 0: return 0;
     case 1: dobl(&nextline);
    }
}