From e53bc9604c14b10c34a1e8d057d2e741e8d7ea1b Mon Sep 17 00:00:00 2001 From: Sami Kerola Date: Tue, 24 May 2011 22:56:38 +0200 Subject: lib: add strtoul_or_err() function Signed-off-by: Sami Kerola Signed-off-by: Karel Zak --- lib/strutils.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'lib/strutils.c') diff --git a/lib/strutils.c b/lib/strutils.c index 07010f32c..e7a2454a0 100644 --- a/lib/strutils.c +++ b/lib/strutils.c @@ -213,6 +213,30 @@ err: errx(EXIT_FAILURE, "%s: '%s'", errmesg, str); return 0; } +/* + * same as strtoul(3) but exit on failure instead of returning crap + */ +unsigned long strtoul_or_err(const char *str, const char *errmesg) +{ + unsigned long num; + char *end = NULL; + + if (str == NULL || *str == '\0') + goto err; + errno = 0; + num = strtoul(str, &end, 10); + + if (errno || str == end || (end && *end)) + goto err; + + return num; +err: + if (errno) + err(EXIT_FAILURE, "%s: '%s'", errmesg, str); + else + errx(EXIT_FAILURE, "%s: '%s'", errmesg, str); + return 0; +} /* * Converts stat->st_mode to ls(1)-like mode string. The size of "str" must -- cgit v1.2.3-55-g7522