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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/dialog/rc.c |
/*
* $Id: rc.c,v 1.47 2011/06/20 22:30:04 tom Exp $
*
* rc.c -- routines for processing the configuration file
*
* Copyright 2000-2010,2011 Thomas E. Dickey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1
* as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to
* Free Software Foundation, Inc.
* 51 Franklin St., Fifth Floor
* Boston, MA 02110, USA.
*
* An earlier version of this program lists as authors
* Savio Lam (lam836@cs.cuhk.hk)
*/
#include <dialog.h>
#include <dlg_keys.h>
#ifdef HAVE_COLOR
#include <dlg_colors.h>
/*
* For matching color names with color values
*/
static const color_names_st color_names[] =
{
#ifdef HAVE_USE_DEFAULT_COLORS
{"DEFAULT", -1},
#endif
{"BLACK", COLOR_BLACK},
{"RED", COLOR_RED},
{"GREEN", COLOR_GREEN},
{"YELLOW", COLOR_YELLOW},
{"BLUE", COLOR_BLUE},
{"MAGENTA", COLOR_MAGENTA},
{"CYAN", COLOR_CYAN},
{"WHITE", COLOR_WHITE},
}; /* color names */
#define COLOR_COUNT (sizeof(color_names) / sizeof(color_names[0]))
#endif /* HAVE_COLOR */
#define GLOBALRC "/etc/dialogrc"
#define DIALOGRC ".dialogrc"
/* Types of values */
#define VAL_INT 0
#define VAL_STR 1
#define VAL_BOOL 2
/* Type of line in configuration file */
typedef enum {
LINE_ERROR = -1,
LINE_EQUALS,
LINE_EMPTY
} PARSE_LINE;
/* number of configuration variables */
#define VAR_COUNT (sizeof(vars) / sizeof(vars_st))
/* check if character is white space */
#define whitespace(c) (c == ' ' || c == TAB)
/* check if character is string quoting characters */
#define isquote(c) (c == '"' || c == '\'')
/* get last character of string */
#define lastch(str) str[strlen(str)-1]
/*
* Configuration variables
*/
typedef struct {
const char *name; /* name of configuration variable as in DIALOGRC */
void *var; /* address of actual variable to change */
int type; /* type of value */
const char *comment; /* comment to put in "rc" file */
} vars_st;
/*
* This table should contain only references to dialog_state, since dialog_vars
* is reset specially in dialog.c before each widget.
*/
static const vars_st vars[] =
{
{"aspect",
&dialog_state.aspect_ratio,
VAL_INT,
"Set aspect-ration."},
{"separate_widget",
&dialog_state.separate_str,
VAL_STR,
"Set separator (for multiple widgets output)."},
{"tab_len",
&dialog_state.tab_len,
VAL_INT,
"Set tab-length (for textbox tab-conversion)."},
{"visit_items",
&dialog_state.visit_items,
VAL_BOOL,
"Make tab-traversal for checklist, etc., include the list."},
#ifdef HAVE_COLOR
{"use_shadow",
&dialog_state.use_shadow,
VAL_BOOL,
"Shadow dialog boxes? This also turns on color."},
{"use_colors",
&dialog_state.use_colors,
VAL_BOOL,
"Turn color support ON or OFF"},
#endif /* HAVE_COLOR */
}; /* vars */
static int
skip_whitespace(char *str, int n)
{
while (whitespace(str[n]) && str[n] != '\0')
n++;
return n;
}
static int
skip_keyword(char *str, int n)
{
while (isalnum(UCH(str[n])) && str[n] != '\0')
n++;
return n;
}
static int
find_vars(char *name)
{
int result = -1;
unsigned i;
for (i = 0; i < VAR_COUNT; i++) {
if (dlg_strcmp(vars[i].name, name) == 0) {
result = (int) i;
break;
}
}
return result;
}
#ifdef HAVE_COLOR
static int
find_color(char *name)
{
int result = -1;
int i;
int limit = dlg_color_count();
for (i = 0; i < limit; i++) {
if (dlg_strcmp(dlg_color_table[i].name, name) == 0) {
result = i;
break;
}
}
return result;
}
/*
* Convert an attribute to a string representation like this:
*
* "(foreground,background,highlight)"
*/
static char *
attr_to_str(char *str, int fg, int bg, int hl)
{
int i;
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;
}
/*
* 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, get_fg = 1;
unsigned j;
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 */
i = skip_whitespace(tempstr, 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 ',' */
i = skip_whitespace(tempstr, i);
if (tempstr[i] != ',')
return -1; /* invalid representation */
}
tempstr[i++] = '\0'; /* skip the ',' */
for (j = 0; j < COLOR_COUNT && dlg_strcmp(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 */
i = skip_whitespace(tempstr, 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 = (int) strlen(part) - 1;
while (whitespace(part[i]) && i > 0)
i--;
part[i + 1] = '\0';
if (!dlg_strcmp(part, "ON"))
*hl = TRUE;
else if (!dlg_strcmp(part, "OFF"))
*hl = FALSE;
else
return -1; /* invalid highlight value */
return 0;
}
#endif /* HAVE_COLOR */
/*
* Check if the line begins with a special keyword; if so, return true while
* pointing params to its parameters.
*/
static int
begins_with(char *line, const char *keyword, char **params)
{
int i = skip_whitespace(line, 0);
int j = skip_keyword(line, i);
if ((j - i) == (int) strlen(keyword)) {
char save = line[j];
line[j] = 0;
if (!dlg_strcmp(keyword, line + i)) {
*params = line + skip_whitespace(line, j + 1);
return 1;
}
line[j] = save;
}
return 0;
}
/*
* 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_EMPTY - line is blank or comment
* LINE_EQUALS - line contains "variable = value"
* LINE_ERROR - syntax error in line
*/
static PARSE_LINE
parse_line(char *line, char **var, char **value)
{
int i = 0;
/* ignore white space at beginning of line */
i = skip_whitespace(line, i);
if (line[i] == '\0') /* line is blank */
return LINE_EMPTY;
else if (line[i] == '#') /* line is comment */
return LINE_EMPTY;
else if (line[i] == '=') /* variable names cannot start 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 '=' */
i = skip_whitespace(line, i);
if (line[i] != '=') /* syntax error */
return LINE_ERROR;
else
i++; /* skip the '=' */
}
/* skip white space after '=' */
i = skip_whitespace(line, i);
if (line[i] == '\0')
return LINE_ERROR;
else
*value = line + i; /* set 'value' to value string */
/* trim trailing white space from 'value' */
i = (int) strlen(*value) - 1;
while (whitespace((*value)[i]) && i > 0)
i--;
(*value)[i + 1] = '\0';
return LINE_EQUALS; /* no syntax error in line */
}
/*
* Create the configuration file
*/
void
dlg_create_rc(const char *filename)
{
unsigned i;
FILE *rc_file;
if ((rc_file = fopen(filename, "wt")) == NULL)
dlg_exiterr("Error opening file for writing in dlg_create_rc().");
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"
#ifdef HAVE_COLOR
"\
# Attribute - (foreground,background,highlight?)\n"
#endif
);
/* Print an entry for each configuration variable */
for (i = 0; i < VAR_COUNT; i++) {
fprintf(rc_file, "\n# %s\n", vars[i].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;
}
}
#ifdef HAVE_COLOR
for (i = 0; i < (unsigned) dlg_color_count(); ++i) {
char buffer[MAX_LEN + 1];
fprintf(rc_file, "\n# %s\n", dlg_color_table[i].comment);
fprintf(rc_file, "%s = %s\n", dlg_color_table[i].name,
attr_to_str(buffer,
dlg_color_table[i].fg,
dlg_color_table[i].bg,
dlg_color_table[i].hilite));
}
#endif /* HAVE_COLOR */
dlg_dump_keys(rc_file);
(void) fclose(rc_file);
}
/*
* Parse the configuration file and set up variables
*/
int
dlg_parse_rc(void)
{
int i;
int l = 1;
PARSE_LINE parse;
char str[MAX_LEN + 1];
char *var;
char *value;
char *tempptr;
int result = 0;
FILE *rc_file = 0;
char *params;
/*
* At startup, dialog determines the settings to use as follows:
*
* a) if the environment variable $DIALOGRC is set, its 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, try using the GLOBALRC file.
* Usually this will be /etc/dialogrc.
*
* d) if the file in (c) cannot be found, use the compiled-in defaults.
*/
/* try step (a) */
if ((tempptr = getenv("DIALOGRC")) != NULL)
rc_file = fopen(tempptr, "rt");
if (rc_file == NULL) { /* step (a) failed? */
/* try step (b) */
if ((tempptr = getenv("HOME")) != NULL
&& strlen(tempptr) < MAX_LEN - (sizeof(DIALOGRC) + 3)) {
if (tempptr[0] == '\0' || lastch(tempptr) == '/')
sprintf(str, "%s%s", tempptr, DIALOGRC);
else
sprintf(str, "%s/%s", tempptr, DIALOGRC);
rc_file = fopen(tempptr = str, "rt");
}
}
if (rc_file == NULL) { /* step (b) failed? */
/* try step (c) */
strcpy(str, GLOBALRC);
if ((rc_file = fopen(tempptr = str, "rt")) == NULL)
return 0; /* step (c) failed, use default values */
}
DLG_TRACE(("opened rc file \"%s\"\n", tempptr));
/* Scan each line and set variables */
while ((result == 0) && (fgets(str, MAX_LEN, rc_file) != NULL)) {
DLG_TRACE(("rc:%s", str));
if (*str == '\0' || lastch(str) != '\n') {
/* ignore rest of file if line too long */
fprintf(stderr, "\nParse error: line %d of configuration"
" file too long.\n", l);
result = -1; /* parse aborted */
break;
}
lastch(str) = '\0';
if (begins_with(str, "bindkey", ¶ms)) {
dlg_parse_bindkey(params);
continue;
}
parse = parse_line(str, &var, &value); /* parse current line */
switch (parse) {
case LINE_EMPTY: /* ignore blank lines and comments */
break;
case LINE_EQUALS:
/* search table for matching config variable name */
if ((i = find_vars(var)) >= 0) {
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);
result = -1; /* parse aborted */
} else {
/* remove the (") quotes */
value++;
lastch(value) = '\0';
strcpy((char *) vars[i].var, value);
}
break;
case VAL_BOOL:
if (!dlg_strcmp(value, "ON"))
*((bool *) vars[i].var) = TRUE;
else if (!dlg_strcmp(value, "OFF"))
*((bool *) vars[i].var) = FALSE;
else {
fprintf(stderr, "\nParse error: boolean value "
"expected at line %d of configuration "
"file (found %s).\n", l, value);
result = -1; /* parse aborted */
}
break;
}
#ifdef HAVE_COLOR
} else if ((i = find_color(var)) >= 0) {
int fg = 0;
int bg = 0;
int hl = 0;
if (str_to_attr(value, &fg, &bg, &hl) == -1) {
fprintf(stderr, "\nParse error: attribute "
"value expected at line %d of configuration "
"file.\n", l);
result = -1; /* parse aborted */
} else {
dlg_color_table[i].fg = fg;
dlg_color_table[i].bg = bg;
dlg_color_table[i].hilite = hl;
}
} else {
#endif /* HAVE_COLOR */
fprintf(stderr, "\nParse error: unknown variable "
"at line %d of configuration file:\n\t%s\n", l, var);
result = -1; /* parse aborted */
}
break;
case LINE_ERROR:
fprintf(stderr, "\nParse error: syntax error at line %d of "
"configuration file.\n", l);
result = -1; /* parse aborted */
break;
}
l++; /* next line */
}
(void) fclose(rc_file);
return result;
}