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/*
* util.c - useful functions
*
* Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
* Copyright © 2006 Pierre Habouzit <madcoder@debian.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "common/util.h"
#include <stdarg.h>
#include <sys/wait.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
const char *
a_current_time_str(void)
{
static char buffer[25];
time_t now;
struct tm tm;
time(&now);
localtime_r(&now, &tm);
if (!strftime(buffer, sizeof(buffer), "%Y-%m-%d %T ", &tm))
buffer[0] = '\0';
return buffer;
}
/** Print error and exit with EXIT_FAILURE code.
*/
void
_fatal(int line, const char *fct, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%sE: awesome: %s:%d: ", a_current_time_str(), fct, line);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(EXIT_FAILURE);
}
/** Print error message on stderr.
*/
void
_warn(int line, const char *fct, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%sW: awesome: %s:%d: ", a_current_time_str(), fct, line);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
/** \brief safe limited strcpy.
*
* Copies at most min(<tt>n-1</tt>, \c l) characters from \c src into \c dst,
* always adding a final \c \\0 in \c dst.
*
* \param[in] dst destination buffer.
* \param[in] n size of the buffer. Negative sizes are allowed.
* \param[in] src source string.
* \param[in] l maximum number of chars to copy.
*
* \return minimum of \c src \e length and \c l.
*/
ssize_t
a_strncpy(char *dst, ssize_t n, const char *src, ssize_t l)
{
ssize_t len = MIN(a_strlen(src), l);
if (n > 0)
{
ssize_t dlen = MIN(n - 1, len);
memcpy(dst, src, dlen);
dst[dlen] = '\0';
}
return len;
}
/** \brief safe strcpy.
*
* Copies at most <tt>n-1</tt> characters from \c src into \c dst, always
* adding a final \c \\0 in \c dst.
*
* \param[in] dst destination buffer.
* \param[in] n size of the buffer. Negative sizes are allowed.
* \param[in] src source string.
* \return \c src \e length. If this value is \>= \c n then the copy was
* truncated.
*/
ssize_t
a_strcpy(char *dst, ssize_t n, const char *src)
{
ssize_t len = a_strlen(src);
if (n > 0)
{
ssize_t dlen = MIN(n - 1, len);
memcpy(dst, src, dlen);
dst[dlen] = '\0';
}
return len;
}
/** Execute a command and replace the current process.
* \param cmd The command to execute.
*/
void
a_exec(const char *cmd)
{
static const char *shell = NULL;
if(!shell && !(shell = getenv("SHELL")))
shell = "/bin/sh";
execlp(shell, shell, "-c", cmd, NULL);
fatal("execlp() failed: %s", strerror(errno));
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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