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