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Add strbuf_append_strftime()

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This commit is contained in:
Andrew Bettison 2013-04-04 17:40:58 +10:30
parent 65f6e88e67
commit c6666387e8
2 changed files with 33 additions and 1 deletions
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27
strbuf_helpers.c
View File

@ -21,6 +21,8 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include <poll.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <stdarg.h>
#include <sys/wait.h>
#ifdef HAVE_NETINET_IN_H
@ -307,3 +309,28 @@ strbuf strbuf_append_sockaddr(strbuf sb, const struct sockaddr *addr)
}
return sb;
}
strbuf strbuf_append_strftime(strbuf sb, const char *format, const struct tm *tm)
{
// First, try calling strftime(3) directly on the buffer in the strbuf, if there is one and it
// looks to be long enough.
const size_t need = strlen(format); // heuristic, could be better
if (strbuf_str(sb)) {
size_t avail = strbuf_remaining(sb);
if (avail > need) {
size_t n = strftime(strbuf_end(sb), avail + 1, format, tm);
if (n) {
assert(n <= avail);
sb->current += n;
return sb;
}
}
}
// If that didn't work, then call strftime(3) on a temporary buffer and concatenate the result
// into the strbuf.
const size_t len = 500; // should be enough
char *buf = alloca(len + 1);
size_t n = strftime(buf, len + 1, format, tm);
strbuf_ncat(sb, buf, n);
return sb;
}

7
strbuf_helpers.h
View File

@ -100,7 +100,12 @@ strbuf strbuf_append_exit_status(strbuf sb, int status);
*/
struct sockaddr;
strbuf strbuf_append_sockaddr(strbuf sb, const struct sockaddr *);
#define alloca_sockaddr(addr) strbuf_str(strbuf_append_sockaddr(strbuf_alloca(40), (const struct sockaddr *)(addr)))
/* Append a strftime(3) string.
* @author Andrew Bettison <andrew@servalproject.com>
*/
struct tm;
strbuf strbuf_append_strftime(strbuf sb, const char *format, const struct tm *tm);
#endif //__STRBUF_HELPERS_H__