in practice chapter

1 files changed, 59 insertions, 0 deletions

diff --git a/in_practice/breakout/sys.c b/in_practice/breakout/sys.c
new file mode 100644
index 0000000..bba6ff2
--- /dev/null
+++ b/in_practice/breakout/sys.c
@@ -0,0 +1,59 @@
+#include "sys.h"
+#include "types.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+void info(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	printf("info: ");
+	vprintf(fmt, args);
+	printf("\n");
+	va_end(args);
+}
+
+void die(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	fprintf(stderr, "error: ");
+	vfprintf(stderr, fmt, args);
+	printf("\n");
+	va_end(args);
+	_exit(1);
+}
+
+void *read_entire_file(const char *filename)
+{
+	void *result = 0;
+	FILE *file = fopen(filename, "rb");
+	if (!file) return result;
+	fseek(file, 0, SEEK_END);
+	long size = ftell(file);
+	fseek(file, 0, SEEK_SET);
+	result = malloc(size + 1);
+	fread(result, size, 1, file);
+	fclose(file);
+	*((u8 *)result + size) = '\0';
+	return result;
+}
+
+const char *get_bin_dir(void)
+{
+	char path[512];
+	i64 len = readlink("/proc/self/exe", path, 512 - 1);
+	if (len <= 0)
+		return 0;
+	path[len] = '\0';
+	char *dir = strrchr(path, '/');
+	len = dir - path;
+	dir = malloc(len + 1);
+	memmove(dir, path, len);
+	dir[len] = '\0';
+	return dir;
+}