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322 lines
8.5 KiB
322 lines
8.5 KiB
/**************************************************************************** |
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* tools/cfgpaser.c |
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* |
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* Copyright (C) 2007-2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <string.h> |
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#include <ctype.h> |
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#include "cfgparser.h" |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Data |
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****************************************************************************/ |
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char line[LINESIZE+1]; |
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/**************************************************************************** |
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* Private Data |
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****************************************************************************/ |
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/* These are configuration variable name that are quoted by configuration tool |
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* but which must be unquoted when used in C code. |
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*/ |
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static const char *dequote_list[] = |
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{ |
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/* NuttX */ |
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"CONFIG_USER_ENTRYPOINT", /* Name of entry point function */ |
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/* NxWidgets/NxWM */ |
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"CONFIG_NXWM_BACKGROUND_IMAGE", /* Name of bitmap image class */ |
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"CONFIG_NXWM_STARTWINDOW_ICON", /* Name of bitmap image class */ |
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"CONFIG_NXWM_NXCONSOLE_ICON", /* Name of bitmap image class */ |
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"CONFIG_NXWM_CALIBRATION_ICON", /* Name of bitmap image class */ |
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"CONFIG_NXWM_HEXCALCULATOR_ICON", /* Name of bitmap image class */ |
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NULL /* Marks the end of the list */ |
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}; |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/* Skip over any spaces */ |
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static char *skip_space(char *ptr) |
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{ |
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while (*ptr && isspace((int)*ptr)) ptr++; |
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return ptr; |
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} |
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/* Find the end of a variable string */ |
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static char *find_name_end(char *ptr) |
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{ |
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while (*ptr && (isalnum((int)*ptr) || *ptr == '_')) ptr++; |
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return ptr; |
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} |
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/* Find the end of a value string */ |
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static char *find_value_end(char *ptr) |
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{ |
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while (*ptr && !isspace((int)*ptr)) |
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{ |
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if (*ptr == '"') |
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{ |
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do ptr++; while (*ptr && *ptr != '"'); |
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if (*ptr) ptr++; |
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} |
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else |
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{ |
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do ptr++; while (*ptr && !isspace((int)*ptr) && *ptr != '"'); |
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} |
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} |
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return ptr; |
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} |
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/* Read the next line from the configuration file */ |
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static char *read_line(FILE *stream) |
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{ |
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char *ptr; |
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for (;;) |
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{ |
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line[LINESIZE] = '\0'; |
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if (!fgets(line, LINESIZE, stream)) |
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{ |
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return NULL; |
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} |
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else |
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{ |
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ptr = skip_space(line); |
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if (*ptr && *ptr != '#' && *ptr != '\n') |
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{ |
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return ptr; |
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} |
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} |
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} |
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} |
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/* Parse the line from the configuration file into a variable name |
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* string and a value string. |
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*/ |
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static void parse_line(char *ptr, char **varname, char **varval) |
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{ |
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/* Skip over any leading spaces */ |
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ptr = skip_space(ptr); |
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/* The first no-space is the beginning of the variable name */ |
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*varname = skip_space(ptr); |
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*varval = NULL; |
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/* Parse to the end of the variable name */ |
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ptr = find_name_end(ptr); |
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/* An equal sign is expected next, perhaps after some white space */ |
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if (*ptr && *ptr != '=') |
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{ |
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/* Some else follows the variable name. Terminate the variable |
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* name and skip over any spaces. |
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*/ |
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*ptr = '\0'; |
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ptr = skip_space(ptr + 1); |
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} |
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/* Verify that the equal sign is present */ |
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if (*ptr == '=') |
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{ |
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/* Make sure that the variable name is terminated (this was already |
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* done if the name was followed by white space. |
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*/ |
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*ptr = '\0'; |
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/* The variable value should follow =, perhaps separated by some |
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* white space. |
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*/ |
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ptr = skip_space(ptr + 1); |
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if (*ptr) |
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{ |
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/* Yes.. a variable follows. Save the pointer to the start |
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* of the variable string. |
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*/ |
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*varval = ptr; |
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/* Find the end of the variable string and make sure that it |
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* is terminated. |
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*/ |
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ptr = find_value_end(ptr); |
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*ptr = '\0'; |
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} |
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} |
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} |
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static char *dequote_value(const char *varname, char *varval) |
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{ |
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const char **dqnam; |
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char *dqval = varval; |
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int len; |
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if (dqval) |
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{ |
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/* Check if the variable name is in the list of strings to be dequoated */ |
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for (dqnam = dequote_list; *dqnam; dqnam++) |
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{ |
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if (strcmp(*dqnam, varname) == 0) |
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{ |
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break; |
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} |
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} |
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/* Did we find the variable name in the list of configuration variables |
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* to be dequoated? |
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*/ |
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if (*dqnam) |
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{ |
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/* Yes... Check if there is a traiing quote */ |
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len = strlen(dqval); |
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if (dqval[len-1] == '"') |
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{ |
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/* Yes... replace it with a terminator */ |
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dqval[len-1] = '\0'; |
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len--; |
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} |
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/* Is there a leading quote? */ |
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if (dqval[0] == '"') |
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{ |
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/* Yes.. skip over the leading quote */ |
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dqval++; |
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len--; |
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} |
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/* Handle the case where nothing is left after dequoting */ |
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if (len <= 0) |
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{ |
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dqval = NULL; |
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} |
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} |
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} |
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return dqval; |
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} |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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void parse_file(FILE *stream) |
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{ |
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char *varname; |
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char *varval; |
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char *ptr; |
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/* Loop until the entire file has been parsed. */ |
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do |
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{ |
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/* Read the next line from the file */ |
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ptr = read_line(stream); |
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if (ptr) |
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{ |
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/* Parse the line into a variable and a value field */ |
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parse_line(ptr, &varname, &varval); |
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/* Was a variable name found? */ |
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if (varname) |
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{ |
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/* Yes.. dequote the value if necessary */ |
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varval = dequote_value(varname, varval); |
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/* If no value was provided or if the special value 'n' was provided, |
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* then undefine the configuration variable. |
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*/ |
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if (!varval || strcmp(varval, "n") == 0) |
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{ |
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printf("#undef %s\n", varname); |
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} |
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/* Simply define the configuration variable if it has the special |
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* value "y" |
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*/ |
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else if (strcmp(varval, "y") == 0) |
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{ |
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printf("#define %s 1\n", varname); |
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} |
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/* Otherwise, use the value as provided */ |
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else |
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{ |
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printf("#define %s %s\n", varname, varval); |
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} |
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} |
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} |
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} |
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while (ptr); |
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}
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