from.c

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#include "config.h"
#include <stdbool.h>
#include <stdio.h>
#include <time.h>
#include "mutt/lib.h"
#include "from.h"
 
bool is_from(const char *s, char *path, size_t pathlen, time_t *tp)
{
  bool lax = false;
 
  const regmatch_t *match = mutt_prex_capture(PREX_MBOX_FROM, s);
  if (!match)
  {
    match = mutt_prex_capture(PREX_MBOX_FROM_LAX, s);
    if (!match)
    {
      mutt_debug(LL_DEBUG1, "Could not parse From line: <%s>\n", s);
      return false;
    }
    lax = true;
    mutt_debug(LL_DEBUG2, "Fallback regex for From line: <%s>\n", s);
  }
 
  if (path)
  {
    const regmatch_t *msender = &match[lax ? PREX_MBOX_FROM_LAX_MATCH_ENVSENDER : PREX_MBOX_FROM_MATCH_ENVSENDER];
    const size_t dsize = MIN(pathlen, mutt_regmatch_len(msender) + 1);
    mutt_str_copy(path, s + mutt_regmatch_start(msender), dsize);
  }
 
  if (tp)
  {
    // clang-format off
    const regmatch_t *mmonth = &match[lax ? PREX_MBOX_FROM_LAX_MATCH_MONTH : PREX_MBOX_FROM_MATCH_MONTH];
    const regmatch_t *mday   = &match[lax ? PREX_MBOX_FROM_LAX_MATCH_DAY   : PREX_MBOX_FROM_MATCH_DAY];
    const regmatch_t *mtime  = &match[lax ? PREX_MBOX_FROM_LAX_MATCH_TIME  : PREX_MBOX_FROM_MATCH_TIME];
    const regmatch_t *myear  = &match[lax ? PREX_MBOX_FROM_LAX_MATCH_YEAR  : PREX_MBOX_FROM_MATCH_YEAR];
    // clang-format on
 
    struct tm tm = { 0 };
    tm.tm_isdst = -1;
    tm.tm_mon = mutt_date_check_month(s + mutt_regmatch_start(mmonth));
    sscanf(s + mutt_regmatch_start(mday), " %d", &tm.tm_mday);
    sscanf(s + mutt_regmatch_start(mtime), "%d:%d:%d", &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
    int year = 0;
    sscanf(s + mutt_regmatch_start(myear), "%d", &year);
    if (year > 1900)
      tm.tm_year = year - 1900;
    else if (year < 70)
      tm.tm_year = year + 100;
    else
      tm.tm_year = year;
    *tp = mutt_date_make_time(&tm, false);
  }
 
  return true;
}