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use gmtime_r() instead of gmtime()

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This avoids pulling in gmtime's static buffer:

function                                             old     new   delta
svlogd_main                                         1401    1412     +11
send_headers                                         668     678     +10
gmtime                                                21       -     -21
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 2/0 up/down: 21/-21)              Total: 0 bytes
   text	   data	    bss	    dec	    hex	filename
 920221	    555	   5804	 926580	  e2374	busybox_old
 920221	    555	   5740	 926516	  e2334	busybox_unstripped
                   ^^^^

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-03-06 18:11:47 +01:00
parent 33f7c8f200
commit e1b1b79269
3 changed files with 8 additions and 3 deletions
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6
networking/httpd.c
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@@ -1046,6 +1046,7 @@ static void send_headers(int responseNum)
/* Fixed size 29-byte string. Example: Sun, 06 Nov 1994 08:49:37 GMT */
char date_str[40]; /* using a bit larger buffer to paranoia reasons */
struct tm tm;
const char *responseString = "";
const char *infoString = NULL;
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
@@ -1074,7 +1075,8 @@ static void send_headers(int responseNum)
* always fit into those kbytes.
*/
strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime(&timer));
strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&timer, &tm));
/* ^^^ using gmtime_r() instead of gmtime() to not use static data */
len = sprintf(iobuf,
"HTTP/1.0 %d %s\r\n"
"Content-type: %s\r\n"
@@ -1128,7 +1130,7 @@ static void send_headers(int responseNum)
#endif
if (file_size != -1) { /* file */
strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime(&last_mod));
strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&last_mod, &tm));
#if ENABLE_FEATURE_HTTPD_RANGES
if (responseNum == HTTP_PARTIAL_CONTENT) {
len += sprintf(iobuf + len,