Add xmalloc and xrealloc wrappers.

string-array.c

@@ -3,18 +3,15 @@
 #include <stdio.h>
 
 #include "string-array.h"
+#include "util.h"
 
 void add_entry(struct str_array *a, char *s)
 {
 	if (a->n == a->c) {
 		if (a->c == 0) a->c = 32;
 		else a->c *= 2;
-		a->v = realloc(a->v, sizeof(*a->v) * a->c);
-		a->m = realloc(a->m, sizeof(*a->m) * a->c);
-		if (!a->v || !a->m) {
-			perror("realloc");
-			exit(1);
-		}
+		a->v = xrealloc(a->v, sizeof(*a->v) * a->c);
+		a->m = xrealloc(a->m, sizeof(*a->m) * a->c);
 	}
 
 	a->v[a->n] = s;

util.c

@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include <unistd.h>
+
 #include "util.h"
 
 void read_entries_from_stream(struct str_array *a, int delim, FILE *input)
@@ -13,3 +16,17 @@ void read_entries_from_stream(struct str_array *a, int delim, FILE *input)
 		tmp = 0;
 	}
 }
+
+void *xmalloc(size_t s) {
+	void *r = malloc(s);
+	if (r) return r;
+	perror("malloc");
+	exit(1);
+}
+
+void *xrealloc(void *p, size_t s) {
+	void *r = realloc(p, s);
+	if (r) return r;
+	perror("realloc");
+	exit(1);
+}

util.h

@@ -6,5 +6,7 @@
 #include "string-array.h"
 
 void read_entries_from_stream(struct str_array *, int, FILE *);
+void *xmalloc(size_t);
+void *xrealloc(void *, size_t);
 
 #endif