initial commit

1 files changed, 83 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..3f4f51d
--- /dev/null
+++ b/util.c
@@ -0,0 +1,83 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+
+/* This isn't a 1:1 wrapper around fgets. It also removes that annoying
+ * trailing \n automatically */
+char *
+xfgets(char *s, size_t size, FILE *stream)
+{
+	char *p;
+	if ((s = fgets(s, size, stream))) {
+		if ((p = strchr(s, '\n')))
+			*p = '\0';
+	} else if (ferror(stream)) {
+		fprintf(stderr, "fgets: %s\n", strerror(errno));
+		exit(1);
+	}
+	return s;
+}
+
+FILE *
+xfopen(const char *pathname, const char *mode)
+{
+	FILE *f;
+	if ((f = fopen(pathname, mode)) == NULL) {
+		fprintf(stderr, "%s: %s\n", pathname, strerror(errno));
+		exit(1);
+	}
+	return f;
+}
+
+int
+xfputs(const char *s, FILE *stream)
+{
+	int d;
+	if ((d = fputs(s, stream)) == EOF) {
+		fprintf(stderr, "fputs: %s\n", strerror(errno));
+		exit(1);
+	}
+	return d;
+}
+
+void *
+xmalloc(size_t size)
+{
+	void *n;
+	if ((n = malloc(size)) == NULL) {
+		fprintf(stderr, "malloc: %s\n", strerror(errno));
+		exit(1);
+	}
+	return n;
+}
+
+void *
+xrealloc(void *ptr, size_t size)
+{
+	void *n;
+	if ((n = realloc(ptr, size)) == NULL) {
+		fprintf(stderr, "malloc: %s\n", strerror(errno));
+		exit(1);
+	}
+	return n;
+}
+
+/* strlcpy is unportable, and strncpy is a mess. So we define our own strlcpy
+ * instead. */
+size_t
+my_strlcpy(char *dst, const char *src, size_t size)
+{
+	const char *p2;
+	char *p1, *stop;
+
+	p1 = dst;
+	p2 = src;
+	stop = dst + size;
+	while (*p2 && p1 != stop)
+		*p1++ = *p2++;
+	*p1 = '\0';
+	return (size_t)(p1 - dst);
+}