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276 lines (243 loc) · 6.41 KB
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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 <stdarg.h>
#include <sys/wait.h>
#include <unistd.h>
#include <limits.h>
#include "util.h"
#include "tokenize.h"
/** 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, "E: awesome: %s:%d: ", 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, "W: awesome: %s:%d: ", fct, line);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
/** Lookup for a function pointer from its name
* in the given name_func_link_t list.
* \param funcname Function name.
* \param len The function name length.
* \param list Function and name link list.
* \return Function pointer.
*/
void *
name_func_lookup(const char *funcname, size_t len, const name_func_link_t *list)
{
int i;
if(funcname && list)
for(i = 0; list[i].name; i++)
if(len == list[i].len && !a_strcmp(funcname, list[i].name))
return list[i].func;
return NULL;
}
/** Lookup for a function name from its pointer
* in the given name_func_link_t list.
* \param funcp Function pointer.
* \param list Function and name link list.
* \return Name of the function.
*/
const char *
name_func_rlookup(void * funcp, const name_func_link_t *list)
{
int i;
if(funcp && list)
for(i = 0; list[i].name; i++)
if(funcp == list[i].func)
return list[i].name;
return NULL;
}
/** Get a position type from a string.
* \param pos The position.
* \param len The string length, -1 if unknown.
* \return A position.
*/
position_t
position_fromstr(const char *pos, ssize_t len)
{
switch(a_tokenize(pos, len))
{
default:
return Top;
case A_TK_BOTTOM:
return Bottom;
case A_TK_RIGHT:
return Right;
case A_TK_LEFT:
return Left;
case A_TK_FLOATING:
return Floating;
}
}
/** Convert a position type to a string.
* \param p The position.
* \return A position string.
*/
const char *
position_tostr(position_t p)
{
switch(p)
{
case Top: return "top";
case Bottom: return "bottom";
case Right: return "right";
case Left: return "left";
case Floating: return "floating";
default: return NULL;
}
}
/** Get a orientation type from a string.
* \param pos The orientation.
* \param len The string length, -1 if unknown.
* \return A orientation.
*/
orientation_t
orientation_fromstr(const char *pos, ssize_t len)
{
switch(a_tokenize(pos, len))
{
default:
return North;
case A_TK_SOUTH:
return South;
case A_TK_EAST:
return East;
}
}
/** Convert a orientation type to a string.
* \param p The orientation.
* \return A orientation string.
*/
const char *
orientation_tostr(orientation_t p)
{
switch(p)
{
case North: return "north";
case South: return "south";
case East: return "east";
default: 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;
}
/** 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";
execl(shell, shell, "-c", cmd, NULL);
}
/** Split a string in substring.
* \param str The string to split.
* \param len The string length.
* \param delim The string delimiter.
* \return A list of string NULL terminted.
*/
char **
a_strsplit(const char *str, ssize_t len, char delim)
{
char **retval;
int comp, i, j = 0, n = 1;
/* count components */
for(i = 0; i < len; i++)
if(str[i] == delim)
n++;
retval = p_new(char *, n + 1);
for(i = 0, comp = 0; comp < n; comp++)
{
if(str[i] == delim)
i++;
for(j = i; str[j] != delim && j < len; j++);
retval[comp] = p_dup(&str[i], j - i + 1);
retval[comp][j - i] = '\0';
i = j;
}
return retval;
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80