move readFile() out of balls.c

1 files changed, 32 insertions, 0 deletions

diff --git a/io.c b/io.c
new file mode 100644
index 0000000..dbd12f4
--- /dev/null
+++ b/io.c
@@ -0,0 +1,32 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "balls.h"
+#include "sysfatal.h"
+
+/*
+ * Read the file called filename. Sets contents to a malloc-allocated string containing
+ * the contents of the file and a terminal '\0'. Sets size to strlen(contents) (excludes
+ * '\0'). Returns non-zero on error.
+ */
+int
+readFile(const char *filename, char **contents, size_t *size) {
+	FILE *f;
+
+	if ((f = fopen(filename, "r")) == NULL) {
+		fprintf(stderr, "Failed to open file '%s'\n", filename);
+		return 1;
+	}
+	fseek(f, 0, SEEK_END);
+	*size = ftell(f);
+	if ((*contents = malloc((*size + 1) * sizeof(char))) == NULL) {
+		fclose(f);
+		fprintf(stderr, "Failed to allocate file buffer for '%s'\n", filename);
+		return 1;
+	}
+	rewind(f);
+	fread(*contents, sizeof(char), *size, f);
+	(*contents)[*size] = '\0';
+	fclose(f);
+	return 0;
+}