[coreboot-gerrit] Change in coreboot[master]: lib/string: Add standard strstr() function

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/44085 )

Change subject: lib/string: Add standard strstr() function
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lib/string: Add standard strstr() function

Adding implementation of standard library strstr()

See https://review.coreboot.org/c/coreboot/+/43741 for context.

Change-Id: I63e26e98ed2dd15542f81c0a3a5e353bb93b7350
Signed-off-by: [e-mail]
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44085
Tested-by: build bot (Jenkins) 
Reviewed-by: Julius Werner 
---
M src/include/string.h
M src/lib/string.c
2 files changed, 11 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Julius Werner: Looks good to me, approved

diff --git a/src/include/string.h b/src/include/string.h
index 8eef068..3cfa18d 100644
--- a/src/include/string.h
+++ b/src/include/string.h
@@ -29,6 +29,7 @@
 int strncmp(const char *s1, const char *s2, int maxlen);
 int strspn(const char *str, const char *spn);
 int strcspn(const char *str, const char *spn);
+char *strstr(const char *haystack, const char *needle);
 char *strtok_r(char *str, const char *delim, char **ptr);
 char *strtok(char *str, const char *delim);
 long atol(const char *str);
diff --git a/src/lib/string.c b/src/lib/string.c
index e8f72a2..9677520 100644
--- a/src/lib/string.c
+++ b/src/lib/string.c
@@ -163,6 +163,16 @@
    return ret;
 }

+char *strstr(const char *haystack, const char *needle)
+{
+	size_t needle_len = strlen(needle);
+	for (; *haystack; haystack++) {
+		if (!strncmp(haystack, needle, needle_len))
+			return (char *)haystack;
+	}
+	return NULL;
+}
+
 char *strtok_r(char *str, const char *delim, char **ptr)
 {
    char *start;