use starts_with in puny.c

1 files changed, 64 insertions, 0 deletions

diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..0ea0a59
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include "gmid.h"
+
+int
+starts_with(const char *str, const char *prefix)
+{
+	size_t i;
+
+	if (prefix == NULL)
+		return 0;
+
+	for (i = 0; prefix[i] != '\0'; ++i)
+		if (str[i] != prefix[i])
+			return 0;
+	return 1;
+}
+
+int
+ends_with(const char *str, const char *sufx)
+{
+	size_t i, j;
+
+	i = strlen(str);
+	j = strlen(sufx);
+
+	if (j > i)
+		return 0;
+
+	i -= j;
+	for (j = 0; str[i] != '\0'; i++, j++)
+		if (str[i] != sufx[j])
+			return 0;
+	return 1;
+}
+
+ssize_t
+filesize(int fd)
+{
+	ssize_t len;
+
+	if ((len = lseek(fd, 0, SEEK_END)) == -1)
+		return -1;
+	if (lseek(fd, 0, SEEK_SET) == -1)
+		return -1;
+	return len;
+}