376 lines
11 KiB
C
376 lines
11 KiB
C
/*
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* rc.c -- routines for processing the configuration file
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*
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* AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <dialog.h>
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#include "dialog.priv.h"
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#include "colors.h"
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#include "rc.h"
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static unsigned char *attr_to_str(int fg, int bg, int hl);
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static int str_to_attr(unsigned char *str, int *fg, int *bg, int *hl);
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static int parse_line(unsigned char *line, unsigned char **var, unsigned char **value);
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/*
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* Create the configuration file
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*/
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void dialog_create_rc(unsigned char *filename)
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{
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int i;
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FILE *rc_file;
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if ((rc_file = fopen(filename, "wt")) == NULL) {
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fprintf(stderr, "\nError opening file for writing in create_rc().\n");
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exit(-1);
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}
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fprintf(rc_file, "#\
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\n# Run-time configuration file for dialog\
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\n#\
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\n# Automatically generated by \"dialog --create-rc <file>\"\
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\n#\
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\n#\
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\n# Types of values:\
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\n#\
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\n# Number - <number>\
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\n# String - \"string\"\
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\n# Boolean - <ON|OFF>\
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\n# Attribute - (foreground,background,highlight?)\
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\n#\n\n");
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/* Print an entry for each configuration variable */
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for (i = 0; i < VAR_COUNT; i++) {
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fprintf(rc_file, "\n# %s\n", vars[i].comment); /* print comment */
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switch (vars[i].type) {
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case VAL_INT:
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fprintf(rc_file, "%s = %d\n", vars[i].name, *((int *) vars[i].var));
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break;
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case VAL_STR:
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fprintf(rc_file, "%s = \"%s\"\n", vars[i].name, (unsigned char *) vars[i].var);
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break;
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case VAL_BOOL:
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fprintf(rc_file, "%s = %s\n", vars[i].name, *((bool *) vars[i].var) ? "ON" : "OFF");
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break;
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case VAL_ATTR:
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fprintf(rc_file, "%s = %s\n", vars[i].name, attr_to_str(((int *) vars[i].var)[0], ((int *) vars[i].var)[1], ((int *) vars[i].var)[2]));
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break;
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}
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}
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fclose(rc_file);
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}
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/* End of create_rc() */
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/*
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* Parse the configuration file and set up variables
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*/
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int parse_rc(void)
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{
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int i, l = 1, parse, fg, bg, hl;
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unsigned char str[MAX_LEN+1], *var, *value, *tempptr;
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FILE *rc_file;
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/*
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*
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* At start, 'dialog' determines the settings to use as follows:
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*
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* a) if environment variable DIALOGRC is set, it's value determines the
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* name of the configuration file.
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*
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* b) if the file in (a) can't be found, use the file $HOME/.dialogrc
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* as the configuration file.
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*
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* c) if the file in (b) can't be found, use compiled in defaults.
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*
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*/
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if ((tempptr = getenv("DIALOGRC")) != NULL)
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rc_file = fopen(tempptr, "rt");
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if (tempptr == NULL || rc_file == NULL) { /* step (a) failed? */
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/* try step (b) */
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if ((tempptr = getenv("HOME")) == NULL)
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return 0; /* step (b) failed, use default values */
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if (tempptr[0] == '\0' || lastch(tempptr) == '/')
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sprintf(str, "%s%s", tempptr, DIALOGRC);
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else
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sprintf(str, "%s/%s", tempptr, DIALOGRC);
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if ((rc_file = fopen(str, "rt")) == NULL)
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return 0; /* step (b) failed, use default values */
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}
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/* Scan each line and set variables */
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while (fgets(str, MAX_LEN, rc_file) != NULL) {
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if (lastch(str) != '\n') { /* ignore rest of file if line too long */
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fprintf(stderr, "\nParse error: line %d of configuration file too long.\n", l);
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fclose(rc_file);
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return -1; /* parse aborted */
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}
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else {
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lastch(str) = '\0';
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parse = parse_line(str, &var, &value); /* parse current line */
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switch (parse) {
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case LINE_BLANK: /* ignore blank lines and comments */
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case LINE_COMMENT:
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break;
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case LINE_OK:
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/* search table for matching config variable name */
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for (i = 0; i < VAR_COUNT && strcmp(vars[i].name, var); i++);
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if (i == VAR_COUNT) { /* no match */
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fprintf(stderr, "\nParse error: unknown variable at line %d of configuration file.\n", l);
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return -1; /* parse aborted */
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}
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else { /* variable found in table, set run time variables */
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switch (vars[i].type) {
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case VAL_INT:
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*((int *) vars[i].var) = atoi(value);
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break;
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case VAL_STR:
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if (!isquote(value[0]) || !isquote(lastch(value)) || strlen(value) < 2) {
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fprintf(stderr, "\nParse error: string value expected at line %d of configuration file.\n", l);
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return -1; /* parse aborted */
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}
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else {
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/* remove the (") quotes */
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value++;
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lastch(value) = '\0';
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strcpy((unsigned char *) vars[i].var, value);
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}
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break;
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case VAL_BOOL:
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if (!strcasecmp(value, "ON"))
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*((bool *) vars[i].var) = TRUE;
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else if (!strcasecmp(value, "OFF"))
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*((bool *) vars[i].var) = FALSE;
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else {
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fprintf(stderr, "\nParse error: boolean value expected at line %d of configuration file.\n", l);
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return -1; /* parse aborted */
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}
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break;
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case VAL_ATTR:
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if (str_to_attr(value, &fg, &bg, &hl) == -1) {
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fprintf(stderr, "\nParse error: attribute value expected at line %d of configuration file.\n", l);
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return -1; /* parse aborted */
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}
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((int *) vars[i].var)[0] = fg;
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((int *) vars[i].var)[1] = bg;
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((int *) vars[i].var)[2] = hl;
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break;
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}
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}
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break;
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case LINE_ERROR:
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fprintf(stderr, "\nParse error: syntax error at line %d of configuration file.\n", l);
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return -1; /* parse aborted */
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}
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}
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l++; /* next line */
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}
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fclose(rc_file);
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return 0; /* parse successful */
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}
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/* End of parse_rc() */
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/*
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* Convert an attribute to a string representation like this:
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*
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* "(foreground,background,highlight)"
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*/
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static unsigned char *attr_to_str(int fg, int bg, int hl)
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{
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int i;
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static unsigned char str[MAX_LEN+1];
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strcpy(str, "(");
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/* foreground */
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for (i = 0; fg != color_names[i].value; i++);
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strcat(str, color_names[i].name);
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strcat(str, ",");
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/* background */
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for (i = 0; bg != color_names[i].value; i++);
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strcat(str, color_names[i].name);
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/* highlight */
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strcat(str, hl ? ",ON)" : ",OFF)");
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return str;
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}
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/* End of attr_to_str() */
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/*
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* Extract the foreground, background and highlight values from an attribute
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* represented as a string in this form:
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*
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* "(foreground,background,highlight)"
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*/
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static int str_to_attr(unsigned char *str, int *fg, int *bg, int *hl)
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{
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int i = 0, j, get_fg = 1;
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unsigned char tempstr[MAX_LEN+1], *part;
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if (str[0] != '(' || lastch(str) != ')')
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return -1; /* invalid representation */
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/* remove the parenthesis */
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strcpy(tempstr, str + 1);
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lastch(tempstr) = '\0';
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/* get foreground and background */
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while (1) {
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/* skip white space before fg/bg string */
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while (whitespace(tempstr[i]) && tempstr[i] != '\0') i++;
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if (tempstr[i] == '\0')
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return -1; /* invalid representation */
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part = tempstr + i; /* set 'part' to start of fg/bg string */
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/* find end of fg/bg string */
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while(!whitespace(tempstr[i]) && tempstr[i] != ',' && tempstr[i] != '\0') i++;
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if (tempstr[i] == '\0')
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return -1; /* invalid representation */
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else if (whitespace(tempstr[i])) { /* not yet ',' */
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tempstr[i++] = '\0';
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/* skip white space before ',' */
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while(whitespace(tempstr[i]) && tempstr[i] != '\0') i++;
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if (tempstr[i] != ',')
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return -1; /* invalid representation */
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}
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tempstr[i++] = '\0'; /* skip the ',' */
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for (j = 0; j < COLOR_COUNT && strcasecmp(part, color_names[j].name); j++);
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if (j == COLOR_COUNT) /* invalid color name */
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return -1;
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if (get_fg) {
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*fg = color_names[j].value;
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get_fg = 0; /* next we have to get the background */
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}
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else {
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*bg = color_names[j].value;
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break;
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}
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} /* got foreground and background */
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/* get highlight */
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/* skip white space before highlight string */
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while (whitespace(tempstr[i]) && tempstr[i] != '\0') i++;
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if (tempstr[i] == '\0')
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return -1; /* invalid representation */
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part = tempstr + i; /* set 'part' to start of highlight string */
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/* trim trailing white space from highlight string */
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i = strlen(part) - 1;
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while(whitespace(part[i])) i--;
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part[i+1] = '\0';
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if (!strcasecmp(part, "ON"))
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*hl = TRUE;
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else if (!strcasecmp(part, "OFF"))
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*hl = FALSE;
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else
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return -1; /* invalid highlight value */
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return 0;
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}
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/* End of str_to_attr() */
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/*
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* Parse a line in the configuration file
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*
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* Each line is of the form: "variable = value". On exit, 'var' will contain
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* the variable name, and 'value' will contain the value string.
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*
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* Return values:
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*
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* LINE_BLANK - line is blank
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* LINE_COMMENT - line is comment
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* LINE_OK - line is ok
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* LINE_ERROR - syntax error in line
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*/
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static int parse_line(unsigned char *line, unsigned char **var, unsigned char **value)
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{
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int i = 0;
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/* ignore white space at beginning of line */
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while(whitespace(line[i]) && line[i] != '\0') i++;
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if (line[i] == '\0') /* line is blank */
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return LINE_BLANK;
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else if (line[i] == '#') /* line is comment */
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return LINE_COMMENT;
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else if (line[i] == '=') /* variables names can't strart with a '=' */
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return LINE_ERROR;
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/* set 'var' to variable name */
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*var = line + i++; /* skip to next character */
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/* find end of variable name */
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while(!whitespace(line[i]) && line[i] != '=' && line[i] != '\0') i++;
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if (line[i] == '\0') /* syntax error */
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return LINE_ERROR;
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else if (line[i] == '=')
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line[i++] = '\0';
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else {
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line[i++] = '\0';
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/* skip white space before '=' */
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while(whitespace(line[i]) && line[i] != '\0') i++;
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if (line[i] != '=') /* syntax error */
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return LINE_ERROR;
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else
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i++; /* skip the '=' */
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}
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/* skip white space after '=' */
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while(whitespace(line[i]) && line[i] != '\0') i++;
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if (line[i] == '\0')
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return LINE_ERROR;
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else
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*value = line + i; /* set 'value' to value string */
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/* trim trailing white space from 'value' */
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i = strlen(*value) - 1;
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while(whitespace((*value)[i])) i--;
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(*value)[i+1] = '\0';
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return LINE_OK; /* no syntax error in line */
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}
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/* End of parse_line() */
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