int modified_since(time_t * mtime, char *if_modified_since)
{
struct tm *file_gmt;
char *ims_info;
char monthname[10 + 1];
int day, month, year, hour, minute, second;
int comp;
ims_info = if_modified_since;
while (*ims_info != ' ' && *ims_info != '\0')
++ims_info;
if (*ims_info != ' ')
return -1;
/* the pre-space in the third scanf skips whitespace for the string */
if (sscanf(ims_info, "%d %3s %d %d:%d:%d GMT", /* RFC 1123 */
&day, monthname, &year, &hour, &minute, &second) == 6);
else if (sscanf(ims_info, "%d-%3s-%d %d:%d:%d GMT", /* RFC 1036 */
&day, monthname, &year, &hour, &minute, &second) == 6)
year += 1900;
else if (sscanf(ims_info, " %3s %d %d:%d:%d %d", /* asctime() format */
monthname, &day, &hour, &minute, &second, &year) == 6);
/* allow this non-standard date format: 31 September 2000 23:59:59 GMT */
/* NOTE: Use if_modified_since here, because the date *starts*
* with the day, versus a throwaway item
*/
else if (sscanf(if_modified_since, "%d %10s %d %d:%d:%d GMT",
&day, monthname, &year, &hour, &minute, &second) == 6);
else {
log_error_time();
fprintf(stderr, "Error in %s, line %d: Unable to sscanf \"%s\"\n",
__FILE__, __LINE__, ims_info);
return -1; /* error */
}
file_gmt = gmtime(mtime);
month = month2int(monthname);
/* Go through from years to seconds -- if they are ever unequal,
we know which one is newer and can return */
if ((comp = 1900 + file_gmt->tm_year - year))
return (comp > 0);
if ((comp = file_gmt->tm_mon - month))
return (comp > 0);
if ((comp = file_gmt->tm_mday - day))
return (comp > 0);
if ((comp = file_gmt->tm_hour - hour))
return (comp > 0);
if ((comp = file_gmt->tm_min - minute))
return (comp > 0);
if ((comp = file_gmt->tm_sec - second))
return (comp > 0);
return 0; /* this person must really be into the latest/greatest */
}
int modified_since(time_t * mtime, char *if_modified_since)
{
struct tm *file_gmt;
char *ims_info;
char monthname[10 + 1];
int day, month, year, hour, minute, second;
int comp;
ims_info = if_modified_since;
while (*ims_info != ' ' && *ims_info != '\0')
++ims_info;
if (*ims_info != ' ')
return -1;
if (sscanf(ims_info, "%d %3s %d %d:%d:%d GMT",
&day, monthname, &year, &hour, &minute, &second) == 6);
else if (sscanf(ims_info, "%d-%3s-%d %d:%d:%d GMT",
&day, monthname, &year, &hour, &minute, &second) == 6)
year += 1900;
else if (sscanf(ims_info, " %3s %d %d:%d:%d %d",
monthname, &day, &hour, &minute, &second, &year) == 6);
/* NOTE: Use if_modified_since here, because the date *starts*
* with the day, versus a throwaway item
*/
else if (sscanf(if_modified_since, "%d %10s %d %d:%d:%d GMT",
&day, monthname, &year, &hour, &minute, &second) == 6);
else {
log_error_time();
fprintf(stderr, "Error in %s, line %d: Unable to sscanf \"%s\"\n",
__FILE__, __LINE__, ims_info);
return -1;
}
file_gmt = gmtime(mtime);
month = month2int(monthname);
/* Go through from years to seconds -- if they are ever unequal,
we know which one is newer and can return */
if ((comp = 1900 + file_gmt->tm_year - year))
return (comp > 0);
if ((comp = file_gmt->tm_mon - month))
return (comp > 0);
if ((comp = file_gmt->tm_mday - day))
return (comp > 0);
if ((comp = file_gmt->tm_hour - hour))
return (comp > 0);
if ((comp = file_gmt->tm_min - minute))
return (comp > 0);
if ((comp = file_gmt->tm_sec - second))
return (comp > 0);
return 0;
}
