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-rw-r--r--libopts/compat/strchr.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/libopts/compat/strchr.c b/libopts/compat/strchr.c
new file mode 100644
index 0000000000..413f999ff9
--- /dev/null
+++ b/libopts/compat/strchr.c
@@ -0,0 +1,60 @@
+/*
+ SYNOPSIS
+ #include <string.h>
+
+ char *strchr(char const *s, int c);
+
+ char *strrchr(char const *s, int c);
+
+ DESCRIPTION
+ The strchr() function returns a pointer to the first occurrence of the
+ character c in the string s.
+
+ The strrchr() function returns a pointer to the last occurrence of the
+ character c in the string s.
+
+ Here "character" means "byte" - these functions do not work with wide
+ or multi-byte characters.
+
+ RETURN VALUE
+ The strchr() and strrchr() functions return a pointer to the matched
+ character or NULL if the character is not found.
+
+ CONFORMING TO
+ SVID 3, POSIX, BSD 4.3, ISO 9899
+*/
+
+char*
+strchr( char const *s, int c)
+{
+ do {
+ if ((unsigned)*s == (unsigned)c)
+ return s;
+
+ } while (*(++s) != NUL);
+
+ return NULL;
+}
+
+char*
+strrchr( char const *s, int c)
+{
+ char const *e = s + strlen(s);
+
+ for (;;) {
+ if (--e < s)
+ break;
+
+ if ((unsigned)*e == (unsigned)c)
+ return e;
+ }
+ return NULL;
+}
+
+/*
+ * Local Variables:
+ * mode: C
+ * c-file-style: "stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * end of compat/strsignal.c */