129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* util.c - useful functions
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*
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* Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
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* Copyright © 2006 Pierre Habouzit <madcoder@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdarg.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "common/util.h"
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/** Print error and exit with EXIT_FAILURE code.
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*/
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void
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_fatal(int line, const char *fct, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "E: awesome: %s:%d: ", fct, line);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(EXIT_FAILURE);
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}
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/** Print error message on stderr.
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*/
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void
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_warn(int line, const char *fct, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "W: awesome: %s:%d: ", fct, line);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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}
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/** \brief safe limited strcpy.
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*
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* Copies at most min(<tt>n-1</tt>, \c l) characters from \c src into \c dst,
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* always adding a final \c \\0 in \c dst.
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*
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* \param[in] dst destination buffer.
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* \param[in] n size of the buffer. Negative sizes are allowed.
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* \param[in] src source string.
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* \param[in] l maximum number of chars to copy.
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*
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* \return minimum of \c src \e length and \c l.
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*/
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ssize_t
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a_strncpy(char *dst, ssize_t n, const char *src, ssize_t l)
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{
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ssize_t len = MIN(a_strlen(src), l);
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if (n > 0)
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{
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ssize_t dlen = MIN(n - 1, len);
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memcpy(dst, src, dlen);
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dst[dlen] = '\0';
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}
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return len;
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}
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/** \brief safe strcpy.
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*
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* Copies at most <tt>n-1</tt> characters from \c src into \c dst, always
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* adding a final \c \\0 in \c dst.
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*
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* \param[in] dst destination buffer.
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* \param[in] n size of the buffer. Negative sizes are allowed.
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* \param[in] src source string.
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* \return \c src \e length. If this value is \>= \c n then the copy was
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* truncated.
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*/
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ssize_t
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a_strcpy(char *dst, ssize_t n, const char *src)
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{
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ssize_t len = a_strlen(src);
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if (n > 0)
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{
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ssize_t dlen = MIN(n - 1, len);
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memcpy(dst, src, dlen);
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dst[dlen] = '\0';
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}
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return len;
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}
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/** Execute a command and replace the current process.
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* \param cmd The command to execute.
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*/
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void
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a_exec(const char *cmd)
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{
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static const char *shell = NULL;
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if(!shell && !(shell = getenv("SHELL")))
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shell = "/bin/sh";
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execlp(shell, shell, "-c", cmd, NULL);
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fatal("execlp() failed: %s", strerror(errno));
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}
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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