path.c

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Author : Ran Benita
Date : 2012-06-29 17:05:33
Hash : 48b4d30a
Message : Use enum for file types enums are nice for some type safety and readability. This one also removes the distinction between file type mask / file type index and some naming consistency. Signed-off-by: Ran Benita <ran234@gmail.com>
src/xkbcomp/path.c
/************************************************************
 Copyright (c) 1994 by Silicon Graphics Computer Systems, Inc.

 Permission to use, copy, modify, and distribute this
 software and its documentation for any purpose and without
 fee is hereby granted, provided that the above copyright
 notice appear in all copies and that both that copyright
 notice and this permission notice appear in supporting
 documentation, and that the name of Silicon Graphics not be
 used in advertising or publicity pertaining to distribution
 of the software without specific prior written permission.
 Silicon Graphics makes no representation about the suitability
 of this software for any purpose. It is provided "as is"
 without any express or implied warranty.

 SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
 SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
 GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION  WITH
 THE USE OR PERFORMANCE OF THIS SOFTWARE.

 ********************************************************/

#include <errno.h>
#include <limits.h>

#include "path.h"

/**
 * Extract the first token from an include statement.
 * @param str_inout Input statement, modified in-place. Can be passed in
 * repeatedly. If str_inout is NULL, the parsing has completed.
 * @param file_rtrn Set to the include file to be used.
 * @param map_rtrn Set to whatever comes after ), if any.
 * @param nextop_rtrn Set to the next operation in the complete statement.
 * @param extra_data Set to the string between ( and ), if any.
 *
 * @return true if parsing was succcessful, false for an illegal string.
 *
 * Example: "evdev+aliases(qwerty)"
 *      str_inout = aliases(qwerty)
 *      nextop_retrn = +
 *      extra_data = NULL
 *      file_rtrn = evdev
 *      map_rtrn = NULL
 *
 * 2nd run with "aliases(qwerty)"
 *      str_inout = NULL
 *      file_rtrn = aliases
 *      map_rtrn = qwerty
 *      extra_data = NULL
 *      nextop_retrn = ""
 *
 */
bool
XkbParseIncludeMap(char **str_inout, char **file_rtrn, char **map_rtrn,
                   char *nextop_rtrn, char **extra_data)
{
    char *tmp, *str, *next;

    str = *str_inout;
    if ((*str == '+') || (*str == '|'))
    {
        *file_rtrn = *map_rtrn = NULL;
        *nextop_rtrn = *str;
        next = str + 1;
    }
    else if (*str == '%')
    {
        *file_rtrn = *map_rtrn = NULL;
        *nextop_rtrn = str[1];
        next = str + 2;
    }
    else
    {
        /* search for tokens inside the string */
        next = strpbrk(str, "|+");
        if (next)
        {
            /* set nextop_rtrn to \0, next to next character */
            *nextop_rtrn = *next;
            *next++ = '\0';
        }
        else
        {
            *nextop_rtrn = '\0';
            next = NULL;
        }
        /* search for :, store result in extra_data */
        tmp = strchr(str, ':');
        if (tmp != NULL)
        {
            *tmp++ = '\0';
            *extra_data = uDupString(tmp);
        }
        else
        {
            *extra_data = NULL;
        }
        tmp = strchr(str, '(');
        if (tmp == NULL)
        {
            *file_rtrn = uDupString(str);
            *map_rtrn = NULL;
        }
        else if (str[0] == '(')
        {
            free(*extra_data);
            return false;
        }
        else
        {
            *tmp++ = '\0';
            *file_rtrn = uDupString(str);
            str = tmp;
            tmp = strchr(str, ')');
            if ((tmp == NULL) || (tmp[1] != '\0'))
            {
                free(*file_rtrn);
                free(*extra_data);
                return false;
            }
            *tmp++ = '\0';
            *map_rtrn = uDupString(str);
        }
    }
    if (*nextop_rtrn == '\0')
        *str_inout = NULL;
    else if ((*nextop_rtrn == '|') || (*nextop_rtrn == '+'))
        *str_inout = next;
    else
        return false;
    return true;
}

/***====================================================================***/

/**
 * Return the xkb directory based on the type.
 */
const char *
XkbDirectoryForInclude(enum xkb_file_type type)
{
    switch (type)
    {
    case FILE_TYPE_KEYMAP:
        return "keymap";
    case FILE_TYPE_KEYCODES:
        return "keycodes";
    case FILE_TYPE_TYPES:
        return "types";
    case FILE_TYPE_SYMBOLS:
        return "symbols";
    case FILE_TYPE_COMPAT:
        return "compat";
    case FILE_TYPE_GEOMETRY:
        return "geometry";
    case FILE_TYPE_RULES:
        return "rules";
    default:
        return "";
    }
}

/***====================================================================***/

/**
 * Search for the given file name in the include directories.
 *
 * @param ctx the XKB ctx containing the include paths
 * @param type one of FILE_TYPE_TYPES, FILE_TYPE_COMPAT, ..., or
 *             FILE_TYPE_KEYMAP or FILE_TYPE_RULES
 * @param pathRtrn is set to the full path of the file if found.
 *
 * @return an FD to the file or NULL. If NULL is returned, the value of
 * pathRtrn is undefined.
 */
FILE *
XkbFindFileInPath(struct xkb_context *ctx,
                  const char *name, enum xkb_file_type type, char **pathRtrn)
{
    size_t i;
    int ret;
    FILE *file = NULL;
    char buf[PATH_MAX];
    const char *typeDir;

    typeDir = XkbDirectoryForInclude(type);
    for (i = 0; i < xkb_context_num_include_paths(ctx); i++)
    {
        ret = snprintf(buf, sizeof(buf), "%s/%s/%s",
                       xkb_context_include_path_get(ctx, i), typeDir, name);
        if (ret >= (ssize_t)sizeof(buf))
        {
            ERROR("File name (%s/%s/%s) too long\n",
                  xkb_context_include_path_get(ctx, i), typeDir, name);
            ACTION("Ignored\n");
            continue;
        }
        file = fopen(buf, "r");
        if (file == NULL) {
            ERROR("Couldn't open file (%s/%s/%s): %s\n",
                  xkb_context_include_path_get(ctx, i), typeDir, name,
                  strerror(-errno));
            ACTION("Ignored\n");
            continue;
        }
        break;
    }

    if ((file != NULL) && (pathRtrn != NULL))
        *pathRtrn = strdup(buf);
    return file;
}
kc3-lang/libxkbcommon/src/xkbcomp/path.c

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kc3-lang/libxkbcommon /src/xkbcomp/path.c
