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envcrc: check return value of fwrite()

Newer toolchains will often complain about unchecked fwrite():
	envcrc.c:117: warning: ignoring return value of `fwrite, declared
		with attribute warn_unused_result

So check the return value to silence the warnings.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Mike Frysinger 14 years ago
parent
commit
f67066b6b0
1 changed files with 3 additions and 1 deletions
  1. 3 1
      tools/envcrc.c

+ 3 - 1
tools/envcrc.c

@@ -21,6 +21,7 @@
  * MA 02111-1307 USA
  */
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -114,7 +115,8 @@ int main (int argc, char **argv)
 			}
 			for (i = start; i != end; i += step)
 				printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
-			fwrite(dataptr, 1, datasize, stdout);
+			if (fwrite(dataptr, 1, datasize, stdout) != datasize)
+				fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
 		} else {
 			printf("CRC32 from offset %08X to %08X of environment = %08X\n",
 				(unsigned int) (dataptr - envptr),