awesome/util.c

229 lines
5.4 KiB
C

/*
* util.c - useful functions
*
* Copyright © 2007 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 <stdarg.h>
#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>
#include <limits.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xinerama.h>
#include "util.h"
void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
abort();
}
void
eprint(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
void
uicb_exec(awesome_config * awesomeconf,
const char *arg)
{
char path[PATH_MAX];
if(awesomeconf->display)
close(ConnectionNumber(awesomeconf->display));
sscanf(arg, "%s", path);
execlp(path, arg, NULL);
}
void
uicb_spawn(awesome_config * awesomeconf,
const char *arg)
{
static char *shell = NULL;
char *display = NULL;
char *tmp, newdisplay[128];
if(!shell && !(shell = getenv("SHELL")))
shell = a_strdup("/bin/sh");
if(!arg)
return;
if(!XineramaIsActive(awesomeconf->display) && (tmp = getenv("DISPLAY")))
{
display = a_strdup(tmp);
if((tmp = strrchr(display, '.')))
*tmp = '\0';
snprintf(newdisplay, sizeof(newdisplay), "%s.%d", display, awesomeconf->screen);
setenv("DISPLAY", newdisplay, 1);
}
/* The double-fork construct avoids zombie processes and keeps the code
* clean from stupid signal handlers. */
if(fork() == 0)
{
if(fork() == 0)
{
if(awesomeconf->display)
close(ConnectionNumber(awesomeconf->display));
setsid();
execl(shell, shell, "-c", arg, (char *) NULL);
fprintf(stderr, "awesome: execl '%s -c %s'", shell, arg);
perror(" failed");
}
exit(EXIT_SUCCESS);
}
wait(0);
}
Bool
xgettextprop(Display *disp, Window w, Atom atom, char *text, ssize_t textlen)
{
char **list = NULL;
int n;
XTextProperty name;
if(!text || !textlen)
return False;
text[0] = '\0';
XGetTextProperty(disp, w, &name, atom);
if(!name.nitems)
return False;
if(name.encoding == XA_STRING)
a_strncpy(text, textlen, (char *) name.value, textlen - 1);
else if(XmbTextPropertyToTextList(disp, &name, &list, &n) >= Success && n > 0 && *list)
{
a_strncpy(text, textlen, *list, textlen - 1);
XFreeStringList(list);
}
text[textlen - 1] = '\0';
XFree(name.value);
return True;
}
double
compute_new_value_from_arg(const char *arg, double current_value)
{
double delta;
if(arg && sscanf(arg, "%lf", &delta) == 1)
{
if(arg[0] == '+' || arg[0] == '-')
current_value += delta;
else
current_value = delta;
}
return current_value;
}
/** Lookup for a function pointer from its name
* in the given NameFuncLink list
* \param funcname Function name
* \param list Function and name link list
* \return function pointer
*/
void *
name_func_lookup(const char *funcname, const NameFuncLink * list)
{
int i;
if(funcname && list)
for(i = 0; list[i].name; i++)
if(!a_strcmp(funcname, list[i].name))
return list[i].func;
return NULL;
}
/** \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;
}
// vim: filetype=c:expandtab:shiftwidth=6:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99