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/*
* 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 <fcntl.h>
#include <string.h>
#include <linux/limits.h>
#include "utils.h"
#include "log.h"
char *basename(const char *path)
{
const char *cp = strrchr(path, '/');
if(cp) {
return (char *) cp + 1;
} else {
return (char *) path;
}
}
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);
}
char *device_lock(const char *path)
{
int tmp;
char *name = basename(path);
int fd;
char str[32];
char *lock;
tmp = asprintf(&lock, "/var/lock/LCK..%s", name);
if (tmp < 0) {
log_error("out of memory");
return NULL;
}
fd = open(lock, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL, 0644);
if (fd < 0) {
log_error("failed to create %s: %m", lock);
free(lock);
return NULL;
}
snprintf(str, sizeof(str), "%10d\n", getpid());
full_write(fd, str, strlen(str));
close(fd);
return lock;
}
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