[flashrom-gerrit] Change in flashrom[master]: helpers: Implement strndup() for MinGW

[Nico Huber (Code Review)]

Nico Huber has submitted this change. ( https://review.coreboot.org/c/flashrom/+/34621 )

Change subject: helpers: Implement strndup() for MinGW
......................................................................

helpers: Implement strndup() for MinGW

Provide strndup implementation if compiled with MinGW because
it is a POSIX only method

Signed-off-by: Miklós Márton 
Change-Id: If418080bffff1f5961cacf2a300ea9c666682458
Reviewed-on: https://review.coreboot.org/c/flashrom/+/34621
Tested-by: build bot (Jenkins) 
Reviewed-by: Nico Huber 
---
M flash.h
M helpers.c
2 files changed, 15 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nico Huber: Looks good to me, approved

diff --git a/flash.h b/flash.h
index c1d8980..1a9bd9f 100644
--- a/flash.h
+++ b/flash.h
@@ -314,6 +314,7 @@
 void reverse_bytes(uint8_t *dst, const uint8_t *src, size_t length);
 #ifdef __MINGW32__
 char* strtok_r(char *str, const char *delim, char **nextp);
+char *strndup(const char *str, size_t size);
 #endif
 #if defined(__DJGPP__) || (!defined(__LIBPAYLOAD__) && !defined(HAVE_STRNLEN))
 size_t strnlen(const char *str, size_t n);
diff --git a/helpers.c b/helpers.c
index cfa9812..c83cd2c 100644
--- a/helpers.c
+++ b/helpers.c
@@ -102,6 +102,20 @@
    *nextp = str;
    return ret;
 }
+
+/* strndup is a POSIX function not present in MinGW */
+char *strndup(const char *src, size_t maxlen)
+{
+	if (strlen(src) > maxlen) {
+		char *retbuf;
+		if ((retbuf = malloc(1 + maxlen)) != NULL) {
+			memcpy(retbuf, src, maxlen);
+			retbuf[maxlen] = '\0';
+		}
+		return retbuf;
+	}
+	return strdup(src);
+}
 #endif

/* There is no strnlen in DJGPP */