Add prefixcmp() (stol^H^H^H^Hborrowed from git)

This allows us to avoid the nasty repetition in strncmp(foo, bar, strlen(foo)). We'll miss out on the compiler optimizing strlen() into sizeof() - 1 for string literals for this; but we don't use this it for performance-critical functions anyways...

Add prefixcmp() (stol^H^H^H^Hborrowed from git)
f5df13f8 · Eric Wong · Max Kellermann · 15b25ad1 · f5df13f8 · f5df13f8
Commit f5df13f8 authored Sep 23, 2008 by Eric Wong Committed by Max Kellermann Sep 23, 2008
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utils.c src/utils.c +10 -0

utils.h src/utils.h +2 -0

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--- a/src/utils.c
+++ b/src/utils.c
@@ -268,3 +268,13 @@ void xpthread_cond_destroy(pthread_cond_t *cond)
 	if ((err = pthread_cond_destroy(cond)))
 		FATAL("failed to destroy cond: %s\n", strerror(err));
 }
+
+int prefixcmp(const char *str, const char *prefix)
+{
+	for (; ; str++, prefix++)
+		if (!*prefix)
+			return 0;
+		else if (*str != *prefix)
+			return (unsigned char)*prefix - (unsigned char)*str;
+}
+
--- a/src/utils.h
+++ b/src/utils.h
@@ -103,4 +103,6 @@ void xpthread_mutex_destroy(pthread_mutex_t *mutex);

 void xpthread_cond_destroy(pthread_cond_t *cond);

+int prefixcmp(const char *str, const char *prefix);
+
 #endif