1 files changed, 7 insertions, 105 deletions

diff --git a/runtime/staprun/common.c b/runtime/staprun/common.c
index 26b166c2..c67ce340 100644
--- a/runtime/staprun/common.c
+++ b/runtime/staprun/common.c
@@ -55,112 +55,15 @@ static char *get_abspath(char *path)
 
 int stap_strfloctime(char *buf, size_t max, const char *fmt, time_t t)
 {
-	char *c = buf;
-	const char *c2 = fmt, *end = buf + max;
-	int ret, num;
 	struct tm tm;
+	size_t ret;
 	if (buf == NULL || fmt == NULL || max <= 1)
 		return -EINVAL;
 	localtime_r(&t, &tm);
-
-	while (*c2 != '\0'){
-		if (c + 1 >= end)
-			return -EINVAL;
-		if (*c2 != '%') {
-			*c++ = *c2++;
-			continue;
-		}
-		c2++;
-		switch (*c2++) {
-		case '%':
-			*c++ = '%';
-			break;
-		case 'Y':
-			num = tm.tm_year + 1900;
-			goto numbering;
-		case 'y':
-			num = tm.tm_year % 100;
-			goto numbering02;
-		case 'C':
-			num = ((tm.tm_year + 1900) / 100);
-			goto numbering;
-		case 'm':
-			num = tm.tm_mon + 1;
-			goto numbering02;
-		case 'd':
-			num = tm.tm_mday;
-			goto numbering02;
-		case 'e':
-			num = tm.tm_mday;
-			goto numbering;
-		case 'F':
-			ret = snprintf(c, end - c, "%d-%02d-%02d",
-				tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
-			if (ret < 0) return ret;
-			c += ret;
-			break;
-		case 'H':
-			num = tm.tm_hour;
-			goto numbering02;
-		case 'I':
-			num = tm.tm_hour % 12;
-			if (num == 0) num = 12;
-			goto numbering02;
-		case 'j':
-			ret = snprintf(c, end - c, "%03d", tm.tm_yday + 1);
-			if (ret < 0) return ret;
-			c += ret;
-			break;
-		case 'k':
-			num = tm.tm_hour;
-			goto numbering;
-		case 'l':
-			num = tm.tm_hour % 12;
-			if (num == 0) num = 12;
-			ret = snprintf(c, end - c, "%2d", num);
-			if (ret < 0) return ret;
-			c += ret;
-			break;
-		case 'M':
-			num = tm.tm_min;
-			goto numbering02;
-		case 'S':
-			num = tm.tm_sec;
-			goto numbering02;
-		case 'R':
-			ret = snprintf(c, end - c, "%02d:%02d",
-					tm.tm_hour, tm.tm_min);
-			if (ret < 0) return ret;
-			c += ret;
-			break;
-		case 'T':
-			ret = snprintf(c, end - c, "%02d:%02d:%02d",
-					tm.tm_hour, tm.tm_min, tm.tm_sec);
-			if (ret < 0) return ret;
-			c += ret;
-			break;
-		case 'u':
-			num = tm.tm_wday == 0 ? 7 : tm.tm_wday;
-			goto numbering;
-		case 'w':
-			num = tm.tm_wday;
-			goto numbering;
-		default:
-			return -EINVAL;
-		}
-		continue;
-numbering:
-		ret = snprintf(c, end - c, "%d", num);
-		if (ret < 0) return ret;
-		c += ret;
-		continue;
-numbering02:
-		ret = snprintf(c, end - c, "%02d", num);
-		if (ret < 0) return ret;
-		c += ret;
-	}
-	*c = '\0';
-	return c - buf;
+	ret = strftime(buf, max, fmt, &tm);
+	if (ret == 0)
+		return -EINVAL;
+	return (int)ret;
 }
 
 void parse_args(int argc, char **argv)
@@ -309,9 +212,8 @@ void usage(char *prog)
 	err("                exit when it does.  The '_stp_target' variable\n");
 	err("                will contain the pid for the command.\n");
 	err("-x pid          Sets the '_stp_target' variable to pid.\n");
-	err("-o FILE         Send output to FILE. This supports a subset of\n");
-	err("                strftime(3) (%%%%,%%C,%%Y,%%y,%%m,%%d,%%e,%%F,%%H,%%I\n");
-	err("                %%j,%%k,%%l,%%M,%%S,%%R,%%T,%%u,%%w) for FILE.\n");
+	err("-o FILE         Send output to FILE. This supports strftime(3)\n");
+	err("                formats for FILE.\n");
 	err("-b buffer size  The systemtap module specifies a buffer size.\n");
 	err("                Setting one here will override that value.  The\n");
 	err("                value should be an integer between 1 and 4095 \n");