HardenedBSD/contrib/dialog/rc.c
2021-02-26 10:16:49 +01:00

666 lines
16 KiB
C

/*
* $Id: rc.c,v 1.60 2020/11/25 00:06:40 tom Exp $
*
* rc.c -- routines for processing the configuration file
*
* Copyright 2000-2019,2020 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>
#include <dlg_internals.h>
#define L_PAREN '('
#define R_PAREN ')'
#define MIN_TOKEN 3
#ifdef HAVE_RC_FILE2
#define MAX_TOKEN 5
#else
#define MAX_TOKEN MIN_TOKEN
#endif
#define UNKNOWN_COLOR -2
/*
* 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 TableSize(color_names)
#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 TableSize(vars)
/* 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 (isblank(UCH(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 void
trim_token(char **tok)
{
char *tmp = *tok + skip_whitespace(*tok, 0);
*tok = tmp;
while (*tmp != '\0' && !isblank(UCH(*tmp)))
tmp++;
*tmp = '\0';
}
static int
from_boolean(const char *str)
{
int code = -1;
if (str != NULL && *str != '\0') {
if (!dlg_strcmp(str, "ON")) {
code = 1;
} else if (!dlg_strcmp(str, "OFF")) {
code = 0;
}
}
return code;
}
static int
from_color_name(const char *str)
{
int code = UNKNOWN_COLOR;
if (str != NULL && *str != '\0') {
size_t i;
for (i = 0; i < COLOR_COUNT; ++i) {
if (!dlg_strcmp(str, color_names[i].name)) {
code = color_names[i].value;
break;
}
}
}
return code;
}
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;
}
static const char *
to_color_name(int code)
{
const char *result = "?";
size_t n;
for (n = 0; n < TableSize(color_names); ++n) {
if (code == color_names[n].value) {
result = color_names[n].name;
break;
}
}
return result;
}
static const char *
to_boolean(int code)
{
return code ? "ON" : "OFF";
}
/*
* Extract the foreground, background and highlight values from an attribute
* represented as a string in one of these forms:
*
* "(foreground,background,highlight,underline,reverse)"
* "(foreground,background,highlight,underline)"
* "(foreground,background,highlight)"
* "xxxx_color"
*/
static int
str_to_attr(char *str, DIALOG_COLORS * result)
{
char *tokens[MAX_TOKEN + 1];
char tempstr[MAX_LEN + 1];
size_t have;
size_t i = 0;
size_t tok_count = 0;
memset(result, 0, sizeof(*result));
result->fg = -1;
result->bg = -1;
result->hilite = -1;
if (str[0] != L_PAREN || lastch(str) != R_PAREN) {
int ret;
if ((ret = find_color(str)) >= 0) {
*result = dlg_color_table[ret];
return 0;
}
/* invalid representation */
return -1;
}
/* remove the parenthesis */
have = strlen(str);
if (have > MAX_LEN) {
have = MAX_LEN - 1;
} else {
have -= 2;
}
memcpy(tempstr, str + 1, have);
tempstr[have] = '\0';
/* parse comma-separated tokens, allow up to
* one more than max tokens to detect extras */
while (tok_count < TableSize(tokens)) {
tokens[tok_count++] = &tempstr[i];
while (tempstr[i] != '\0' && tempstr[i] != ',')
i++;
if (tempstr[i] == '\0')
break;
tempstr[i++] = '\0';
}
if (tok_count < MIN_TOKEN || tok_count > MAX_TOKEN) {
/* invalid representation */
return -1;
}
for (i = 0; i < tok_count; ++i)
trim_token(&tokens[i]);
/* validate */
if (UNKNOWN_COLOR == (result->fg = from_color_name(tokens[0]))
|| UNKNOWN_COLOR == (result->bg = from_color_name(tokens[1]))
|| UNKNOWN_COLOR == (result->hilite = from_boolean(tokens[2]))
#ifdef HAVE_RC_FILE2
|| (tok_count >= 4 && (result->ul = from_boolean(tokens[3])) == -1)
|| (tok_count >= 5 && (result->rv = from_boolean(tokens[4])) == -1)
#endif /* HAVE_RC_FILE2 */
) {
/* invalid representation */
return -1;
}
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 (!isblank(UCH(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 (isblank(UCH((*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
#ifdef HAVE_RC_FILE2
"\
# Attribute - (foreground,background,highlight?,underline?,reverse?)\n"
#else /* HAVE_RC_FILE2 */
"\
# Attribute - (foreground,background,highlight?)\n"
#endif /* HAVE_RC_FILE2 */
#endif /* HAVE_COLOR */
);
/* 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) {
unsigned j;
bool repeat = FALSE;
fprintf(rc_file, "\n# %s\n", dlg_color_table[i].comment);
for (j = 0; j != i; ++j) {
if (dlg_color_table[i].fg == dlg_color_table[j].fg
&& dlg_color_table[i].bg == dlg_color_table[j].bg
&& dlg_color_table[i].hilite == dlg_color_table[j].hilite) {
fprintf(rc_file, "%s = %s\n",
dlg_color_table[i].name,
dlg_color_table[j].name);
repeat = TRUE;
break;
}
}
if (!repeat) {
fprintf(rc_file, "%s = %c", dlg_color_table[i].name, L_PAREN);
fprintf(rc_file, "%s", to_color_name(dlg_color_table[i].fg));
fprintf(rc_file, ",%s", to_color_name(dlg_color_table[i].bg));
fprintf(rc_file, ",%s", to_boolean(dlg_color_table[i].hilite));
#ifdef HAVE_RC_FILE2
if (dlg_color_table[i].ul || dlg_color_table[i].rv)
fprintf(rc_file, ",%s", to_boolean(dlg_color_table[i].ul));
if (dlg_color_table[i].rv)
fprintf(rc_file, ",%s", to_boolean(dlg_color_table[i].rv));
#endif /* HAVE_RC_FILE2 */
fprintf(rc_file, "%c\n", R_PAREN);
}
}
#endif /* HAVE_COLOR */
dlg_dump_keys(rc_file);
(void) fclose(rc_file);
}
static void
report_error(const char *filename, int line_no, const char *msg)
{
fprintf(stderr, "%s:%d: %s\n", filename, line_no, msg);
dlg_trace_msg("%s:%d: %s\n", filename, line_no, msg);
}
/*
* 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 *filename;
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 ((filename = dlg_getenv_str("DIALOGRC")) != NULL)
rc_file = fopen(filename, "rt");
if (rc_file == NULL) { /* step (a) failed? */
/* try step (b) */
if ((filename = dlg_getenv_str("HOME")) != NULL
&& strlen(filename) < MAX_LEN - (sizeof(DIALOGRC) + 3)) {
if (filename[0] == '\0' || lastch(filename) == '/')
sprintf(str, "%s%s", filename, DIALOGRC);
else
sprintf(str, "%s/%s", filename, DIALOGRC);
rc_file = fopen(filename = str, "rt");
}
}
if (rc_file == NULL) { /* step (b) failed? */
/* try step (c) */
strcpy(str, GLOBALRC);
if ((rc_file = fopen(filename = str, "rt")) == NULL)
return 0; /* step (c) failed, use default values */
}
DLG_TRACE(("# opened rc file \"%s\"\n", filename));
/* Scan each line and set variables */
while ((result == 0) && (fgets(str, MAX_LEN, rc_file) != NULL)) {
DLG_TRACE(("#\t%s", str));
if (*str == '\0' || lastch(str) != '\n') {
/* ignore rest of file if line too long */
report_error(filename, l, "line too long");
result = -1; /* parse aborted */
break;
}
lastch(str) = '\0';
if (begins_with(str, "bindkey", &params)) {
if (!dlg_parse_bindkey(params)) {
report_error(filename, l, "invalid bindkey");
result = -1;
}
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) {
report_error(filename, l, "expected string value");
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 {
report_error(filename, l, "expected boolean value");
result = -1; /* parse aborted */
}
break;
}
#ifdef HAVE_COLOR
} else if ((i = find_color(var)) >= 0) {
DIALOG_COLORS temp;
if (str_to_attr(value, &temp) == -1) {
report_error(filename, l, "expected attribute value");
result = -1; /* parse aborted */
} else {
dlg_color_table[i].fg = temp.fg;
dlg_color_table[i].bg = temp.bg;
dlg_color_table[i].hilite = temp.hilite;
#ifdef HAVE_RC_FILE2
dlg_color_table[i].ul = temp.ul;
dlg_color_table[i].rv = temp.rv;
#endif /* HAVE_RC_FILE2 */
}
} else {
#endif /* HAVE_COLOR */
report_error(filename, l, "unknown variable");
result = -1; /* parse aborted */
}
break;
case LINE_ERROR:
report_error(filename, l, "syntax error");
result = -1; /* parse aborted */
break;
}
l++; /* next line */
}
(void) fclose(rc_file);
return result;
}