save point

lib/fs.c

@@ -0,0 +1,157 @@
+/* Copyright (C) GCK
+ *
+ * This file is part of gcklib
+ *
+ * This project and file is licensed under the BSD-3-Clause licence.
+ * <https://opensource.org/licence/bsd-3-clause>
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "err.h"
+
+#include "fs.h"
+
+char *fs_read(const char *path)
+{
+	FILE *fptr = fopen(path, "r");
+	if (!fptr)
+		return NULL;
+
+	size_t cap = 1024;
+	size_t len = 0;
+	char *buf = malloc(cap);
+	if (!buf) {
+		fclose(fptr);
+		return NULL;
+	}
+
+	int c;
+	while ((c = fgetc(fptr)) != EOF) {
+		if (len + 1 >= cap) {
+			cap *= 2;
+			char *tmp = realloc(buf, cap);
+			if (!tmp) {
+				free(buf);
+				fclose(fptr);
+				return NULL;
+			}
+			buf = tmp;
+		}
+		buf[len++] = (char)c;
+	}
+	buf[len] = '\0';
+
+	fclose(fptr);
+	return buf;
+}
+
+bool fs_exists(const char *path)
+{
+	FILE *fptr;
+	bool exists;
+
+	fptr = fopen(path, "r");
+	if (fptr) {
+		exists = true;
+	} else {
+		exists = false;
+	}
+
+	return exists;
+}
+
+int fs_append(const char *path, const char *format, ...)
+{
+	FILE *fp = fopen(path, "a");
+	if (!fp)
+		return -1;
+
+	va_list ap;
+	va_start(ap, format);
+	int ret = vfprintf(fp, format, ap);
+	va_end(ap);
+
+	if (ret < 0) {
+		fclose(fp);
+		return -1;
+	}
+
+	if (fclose(fp) != 0)
+		return -1;
+
+	return ret;
+}
+
+int fs_del(const char *path)
+{
+	return remove(path);
+}
+
+int fs_new(const char *path)
+{
+	size_t len;
+	int fd;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	len = strlen(path);
+	if (len == 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (path[len - 1] == '/') {
+		if (mkdir(path, 0777) == -1)
+			return -1;
+	} else {
+		fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
+		if (fd == -1)
+			return -1;
+		close(fd);
+	}
+
+	return 0;
+}
+
+int fs_write(const char *path, const char *format, ...)
+{
+	FILE *fptr = fopen(path, "w");
+	if (!fptr)
+		return -1;
+
+	va_list ap;
+	va_start(ap, format);
+	int ret = vfprintf(fptr, format, ap);
+	va_end(ap);
+
+	if (ret < 0) {
+		fclose(fptr);
+		return -1;
+	}
+
+	if (fclose(fptr) != 0)
+		return -1;
+
+	return ret;
+}
+
+FILE *fs_temp()
+{
+	FILE *fptr = tmpfile();
+
+	if (!fptr) {
+		errorf("tmpfile failed");
+		return NULL;
+	}
+
+	return fptr;
+}