292 lines
6.7 KiB
C
292 lines
6.7 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 "util.h"
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#include "tokenize.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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/** Lookup for a function pointer from its name
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* in the given name_func_link_t list.
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* \param funcname Function name.
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* \param len The function name length.
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* \param list Function and name link list.
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* \return Function pointer.
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*/
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void *
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name_func_lookup(const char *funcname, size_t len, const name_func_link_t *list)
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{
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int i;
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if(funcname && list)
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for(i = 0; list[i].name; i++)
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if(len == list[i].len && !a_strcmp(funcname, list[i].name))
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return list[i].func;
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return NULL;
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}
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/** Lookup for a function name from its pointer
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* in the given name_func_link_t list.
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* \param funcp Function pointer.
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* \param list Function and name link list.
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* \return Name of the function.
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*/
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const char *
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name_func_rlookup(void * funcp, const name_func_link_t *list)
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{
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int i;
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if(funcp && list)
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for(i = 0; list[i].name; i++)
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if(funcp == list[i].func)
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return list[i].name;
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return NULL;
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}
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/** Get a position type from a string.
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* \param pos The position.
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* \param len The string length, -1 if unknown.
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* \return A position.
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*/
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position_t
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position_fromstr(const char *pos, ssize_t len)
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{
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switch(a_tokenize(pos, len))
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{
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default:
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return Top;
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case A_TK_BOTTOM:
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return Bottom;
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case A_TK_RIGHT:
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return Right;
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case A_TK_LEFT:
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return Left;
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case A_TK_FLOATING:
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return Floating;
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}
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}
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/** Convert a position type to a string.
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* \param p The position.
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* \return A position string.
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*/
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const char *
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position_tostr(position_t p)
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{
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switch(p)
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{
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case Top: return "top";
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case Bottom: return "bottom";
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case Right: return "right";
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case Left: return "left";
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case Floating: return "floating";
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default: return NULL;
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}
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}
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/** Get a orientation type from a string.
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* \param pos The orientation.
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* \param len The string length, -1 if unknown.
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* \return A orientation.
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*/
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orientation_t
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orientation_fromstr(const char *pos, ssize_t len)
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{
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switch(a_tokenize(pos, len))
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{
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default:
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return North;
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case A_TK_SOUTH:
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return South;
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case A_TK_EAST:
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return East;
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}
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}
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/** Convert a orientation type to a string.
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* \param p The orientation.
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* \return A orientation string.
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*/
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const char *
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orientation_tostr(orientation_t p)
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{
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switch(p)
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{
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case North: return "north";
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case South: return "south";
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case East: return "east";
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default: return NULL;
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}
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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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execl(shell, shell, "-c", cmd, NULL);
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}
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/** Split a string in substring.
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* \param str The string to split.
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* \param len The string length.
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* \param delim The string delimiter.
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* \return A list of string NULL terminted.
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*/
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char **
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a_strsplit(const char *str, ssize_t len, char delim)
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{
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char **retval;
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int comp, i, j = 0, n = 1;
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/* count components */
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for(i = 0; i < len; i++)
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if(str[i] == delim)
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n++;
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retval = p_new(char *, n + 1);
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for(i = 0, comp = 0; comp < n; comp++)
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{
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if(str[i] == delim)
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i++;
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for(j = i; str[j] != delim && j < len; j++);
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retval[comp] = p_dup(&str[i], j - i + 1);
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retval[comp][j - i] = '\0';
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i = j;
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}
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return retval;
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}
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/** Mark a file descriptor as close-on-exec.
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* \param fd The file descriptor.
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* \return The fcntl() return value.
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*/
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int
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fd_set_close_on_exec(int fd)
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{
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int flags = fcntl(fd, F_GETFD, 0);
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/* ignore errors */
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if(flags < 0)
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return flags;
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return fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
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}
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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