From 14fb44b17123b27e562379f51b75ee889982688d Mon Sep 17 00:00:00 2001
From: James Maki <jmaki@multitech.com>
Date: Fri, 23 Apr 2010 11:58:20 -0500
Subject: initial commit

---
 src/utils.c | 236 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 236 insertions(+)
 create mode 100644 src/utils.c

(limited to 'src/utils.c')

diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..9149319
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,236 @@
+/*
+ * Utilities
+ *
+ * Copyright (C) 2010 by Multi-Tech Systems
+ *
+ * Author: James Maki <jmaki@multitech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <linux/limits.h>
+
+#include "utils.h"
+#include "log.h"
+
+int tokcmp(const char *cmd, const char *pattern)
+{
+	int len = strlen(cmd);
+
+	if (len > strlen(pattern)) {
+		return -1;
+	}
+
+	return memcmp(pattern, cmd, len);
+}
+
+char *strrstrip(char *str)
+{
+	char *end;
+	char *prev;
+
+	if (!str || !*str) {
+		return NULL;
+	}
+	prev = end = str + strlen(str);
+
+	while (end > str && isspace(*(end - 1))) {
+		end--;
+	}
+	*end = '\0';
+
+	return prev == end ? NULL : str;
+}
+
+ssize_t safe_read(int fd, void *buf, size_t count)
+{
+	ssize_t n;
+
+	do {
+		n = read(fd, buf, count);
+	} while (n < 0 && errno == EINTR);
+
+	return n;
+}
+
+ssize_t safe_readn(int fd, void *buf, size_t len)
+{
+	ssize_t cc;
+	ssize_t total;
+
+	total = 0;
+
+	while (len) {
+		cc = safe_read(fd, buf, len);
+
+		if (cc < 0) {
+			if (total) {
+				return total;
+			}
+			return cc;
+		}
+
+		total += cc;
+		buf = buf + cc;
+		len -= cc;
+	}
+
+	return total;
+}
+
+ssize_t safe_write(int fd, const void *buf, size_t count)
+{
+	ssize_t n;
+
+	do {
+		n = write(fd, buf, count);
+	} while (n < 0 && errno == EINTR);
+
+	return n;
+}
+
+ssize_t full_write(int fd, const void *buf, size_t len)
+{
+	ssize_t cc;
+	ssize_t total;
+
+	total = 0;
+
+	while (len) {
+		cc = safe_write(fd, buf, len);
+
+		if (cc < 0) {
+			if (total) {
+				return total;
+			}
+			return cc;
+		}
+
+		total += cc;
+		buf = ((const char *)buf) + cc;
+		len -= cc;
+	}
+
+	return total;
+}
+
+int user_yesno(int def, const char *fmt, ...)
+{
+	char buf[128];
+	char *line;
+	va_list ap;
+
+	while (1) {
+		va_start(ap, fmt);
+		vprintf(fmt, ap);
+		va_end(ap);
+
+		printf("? [%c/%c] ",
+			def == USER_YESNO_YES ? 'Y' : 'y',
+			def == USER_YESNO_NO ? 'N' : 'n');
+
+		line = fgets(buf, sizeof(buf), stdin);
+		if (!line) {
+			return -1;
+		}
+
+		switch (toupper(*line)) {
+		case '\n':
+			return def;
+		case 'Y':
+			return USER_YESNO_YES;
+		case 'N':
+			return USER_YESNO_NO;
+		}
+	}
+
+	return -1;
+}
+
+int systemf(const char *fmt, ...)
+{
+	int err;
+	va_list ap;
+	char *buf;
+
+	va_start(ap, fmt);
+	err = vasprintf(&buf, fmt, ap);
+	va_end(ap);
+	if (err < 0) {
+		log_error("out of memory");
+		return -1;
+	}
+
+	err = system(buf);
+	free(buf);
+
+	return err;
+}
+
+FILE *popenf(const char *mode, const char *fmt, ...)
+{
+	int err;
+	va_list ap;
+	char *buf;
+	FILE *pipe;
+
+	va_start(ap, fmt);
+	err = vasprintf(&buf, fmt, ap);
+	va_end(ap);
+	if (err < 0) {
+		log_error("out of memory");
+		return NULL;
+	}
+
+	pipe = popen(buf, mode);
+	free(buf);
+
+	return pipe;
+}
+
+char *shell_path_expand(const char *path)
+{
+	char buf[PATH_MAX + 1];
+	FILE *file;
+	char *line;
+
+	file = popenf("r", "echo -n \"%s\"", path);
+	if (!file) {
+		log_error("popen failed");
+		return NULL;
+	}
+
+	line = fgets(buf, sizeof(buf), file);
+
+	pclose(file);
+
+	if (!line) {
+		log_error("no line read");
+		return NULL;
+	}
+
+	return strdup(line);
+}
-- 
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