From 656ca7bdd992f6aabbdd5cadbac5241f6e1971a1 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Wed, 12 Sep 2018 16:06:37 +0200 Subject: libbb/u_signal_names.c: don't check errno after bb_strtou Since we're comparing the return value to a smallish integer anyway, we might as well use that bb_strtou() returns UINT_MAX for malformed input. Referencing errno is kinda bloaty on glibc. While NSIG is not in POSIX, we do already rely on it being defined, compile-time const and smallish, since arrays in struct globals_misc are defined in terms of it. function old new delta get_signum 312 286 -26 Signed-off-by: Rasmus Villemoes Signed-off-by: Denys Vlasenko --- libbb/u_signal_names.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'libbb/u_signal_names.c') diff --git a/libbb/u_signal_names.c b/libbb/u_signal_names.c index 866ca85fd..f7d598c7a 100644 --- a/libbb/u_signal_names.c +++ b/libbb/u_signal_names.c @@ -153,8 +153,12 @@ int FAST_FUNC get_signum(const char *name) { unsigned i; + /* bb_strtou returns UINT_MAX on error. NSIG is smaller + * than UINT_MAX on any sane Unix. Hence no need + * to check errno after bb_strtou(). + */ i = bb_strtou(name, NULL, 10); - if (!errno && i < NSIG) /* for shells, we allow 0 too */ + if (i < NSIG) /* for shells, we allow 0 too */ return i; if (strncasecmp(name, "SIG", 3) == 0) name += 3; @@ -204,7 +208,7 @@ int FAST_FUNC get_signum(const char *name) return sigrtmin; if (name[5] == '+') { i = bb_strtou(name + 6, NULL, 10); - if (!errno && i <= sigrtmax - sigrtmin) + if (i <= sigrtmax - sigrtmin) return sigrtmin + i; } } @@ -213,7 +217,7 @@ int FAST_FUNC get_signum(const char *name) return sigrtmax; if (name[5] == '-') { i = bb_strtou(name + 6, NULL, 10); - if (!errno && i <= sigrtmax - sigrtmin) + if (i <= sigrtmax - sigrtmin) return sigrtmax - i; } } -- cgit v1.2.3