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cfg.c

/*
 *  cfg.c - Handling and parsing of yaboot.conf
 *
 *  Copyright (C) 1995 Werner Almesberger
 *                1996 Jakub Jelinek
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include "setjmp.h"
#include "stdarg.h"
#include "stdlib.h"
#include "string.h"
#include "types.h"
#include "prom.h"

/* Imported functions */
extern int strcasecmp(const char *s1, const char *s2);

typedef enum {
     cft_strg, cft_flag, cft_end
} CONFIG_TYPE;

typedef struct {
     CONFIG_TYPE type;
     char *name;
     void *data;
} CONFIG;

#define MAX_TOKEN 200
#define MAX_VAR_NAME MAX_TOKEN
#define EOF -1

CONFIG cf_options[] =
{
     {cft_strg, "device", NULL},
     {cft_strg, "partition", NULL},
     {cft_strg, "default", NULL},
     {cft_strg, "timeout", NULL},
     {cft_strg, "password", NULL},
     {cft_flag, "restricted", NULL},
     {cft_strg, "message", NULL},
     {cft_strg, "root", NULL},
     {cft_strg, "ramdisk", NULL},
     {cft_flag, "read-only", NULL},
     {cft_flag, "read-write", NULL},
     {cft_strg, "append", NULL},
     {cft_strg, "initrd", NULL},
     {cft_flag, "initrd-prompt", NULL},
     {cft_strg, "initrd-size", NULL},
     {cft_flag, "pause-after", NULL},
     {cft_strg, "pause-message", NULL},
     {cft_strg, "init-code", NULL},
     {cft_strg, "init-message", NULL},
     {cft_strg, "fgcolor", NULL},
     {cft_strg, "bgcolor", NULL},
     {cft_strg, "ptypewarning", NULL},
     {cft_end, NULL, NULL}};

CONFIG cf_image[] =
{
     {cft_strg, "image", NULL},
     {cft_strg, "label", NULL},
     {cft_strg, "alias", NULL},
     {cft_flag, "single-key", NULL},
     {cft_flag, "restricted", NULL},
     {cft_strg, "device", NULL},
     {cft_strg, "partition", NULL},
     {cft_strg, "root", NULL},
     {cft_strg, "ramdisk", NULL},
     {cft_flag, "read-only", NULL},
     {cft_flag, "read-write", NULL},
     {cft_strg, "append", NULL},
     {cft_strg, "literal", NULL},
     {cft_strg, "initrd", NULL},
     {cft_flag, "initrd-prompt", NULL},
     {cft_strg, "initrd-size", NULL},
     {cft_flag, "pause-after", NULL},
     {cft_strg, "pause-message", NULL},
     {cft_flag, "novideo", NULL},
     {cft_strg, "sysmap", NULL},
     {cft_end, NULL, NULL}};

static char flag_set;
static char *last_token = NULL, *last_item = NULL, *last_value = NULL;
static int line_num;
static int back = 0;          /* can go back by one char */
static char *currp = NULL;
static char *endp = NULL;
static char *file_name = NULL;
static CONFIG *curr_table = cf_options;
static jmp_buf env;

static struct IMAGES {
     CONFIG table[sizeof (cf_image) / sizeof (cf_image[0])];
     struct IMAGES *next;
} *images = NULL;

void cfg_error (char *msg,...)
{
     va_list ap;

     va_start (ap, msg);
     prom_printf ("Config file error: ");
     prom_vprintf (msg, ap);
     va_end (ap);
     prom_printf (" near line %d in file %s\n", line_num, file_name);
     longjmp (env, 1);
}

void cfg_warn (char *msg,...)
{
     va_list ap;

     va_start (ap, msg);
     prom_printf ("Config file warning: ");
     prom_vprintf (msg, ap);
     va_end (ap);
     prom_printf (" near line %d in file %s\n", line_num, file_name);
}

inline int getc ()
{
     if (currp == endp)
        return EOF;
     return *currp++;
}

#define next_raw next
static int next (void)
{
     int ch;

     if (!back)
        return getc ();
     ch = back;
     back = 0;
     return ch;
}

static void again (int ch)
{
     back = ch;
}

static char *cfg_get_token (void)
{
     char buf[MAX_TOKEN + 1];
     char *here;
     int ch, escaped;

     if (last_token) {
        here = last_token;
        last_token = NULL;
        return here;
     }
     while (1) {
        while (ch = next (), ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r')
             if (ch == '\n' || ch == '\r')
                line_num++;
        if (ch == EOF || ch == (int)NULL)
             return NULL;
        if (ch != '#')
             break;
        while (ch = next_raw (), (ch != '\n' && ch != '\r'))
             if (ch == EOF)
                return NULL;
        line_num++;
     }
     if (ch == '=')
        return strdup ("=");
     if (ch == '"') {
        here = buf;
        while (here - buf < MAX_TOKEN) {
             if ((ch = next ()) == EOF)
                cfg_error ("EOF in quoted string");
             if (ch == '"') {
                *here = 0;
                return strdup (buf);
             }
             if (ch == '\\') {
                ch = next ();
                switch (ch) {
                case '"':
                case '\\':
                   break;
                case '\n':
                case '\r':
                   while ((ch = next ()), ch == ' ' || ch == '\t');
                   if (!ch)
                        continue;
                   again (ch);
                   ch = ' ';
                   break;
                case 'n':
                   ch = '\n';
                   break;
                default:
                   cfg_error ("Bad use of \\ in quoted string");
                }
             } else if ((ch == '\n') || (ch == '\r'))
                cfg_error ("newline is not allowed in quoted strings");
             *here++ = ch;
        }
        cfg_error ("Quoted string is too long");
        return 0;       /* not reached */
     }
     here = buf;
     escaped = 0;
     while (here - buf < MAX_TOKEN) {
        if (escaped) {
             if (ch == EOF)
                cfg_error ("\\ precedes EOF");
             if (ch == '\n')
                line_num++;
             else
                *here++ = ch == '\t' ? ' ' : ch;
             escaped = 0;
        } else {
             if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' || ch == '#' ||
               ch == '=' || ch == EOF) {
                again (ch);
                *here = 0;
                return strdup (buf);
             }
             if (!(escaped = (ch == '\\')))
                *here++ = ch;
        }
        ch = next ();
     }
     cfg_error ("Token is too long");
     return 0;                /* not reached */
}

static void cfg_return_token (char *token)
{
     last_token = token;
}

static int cfg_next (char **item, char **value)
{
     char *this;

     if (last_item) {
        *item = last_item;
        *value = last_value;
        last_item = NULL;
        return 1;
     }
     *value = NULL;
     if (!(*item = cfg_get_token ()))
        return 0;
     if (!strcmp (*item, "="))
        cfg_error ("Syntax error");
     if (!(this = cfg_get_token ()))
        return 1;
     if (strcmp (this, "=")) {
        cfg_return_token (this);
        return 1;
     }
     if (!(*value = cfg_get_token ()))
        cfg_error ("Value expected at EOF");
     if (!strcmp (*value, "="))
        cfg_error ("Syntax error after %s", *item);
     return 1;
}

#if 0
// The one and only call to this procedure is commented out
// below, so we don't need this unless we decide to use it again.
static void cfg_return (char *item, char *value)
{
     last_item = item;
     last_value = value;
}
#endif

static int cfg_set (char *item, char *value)
{
     CONFIG *walk;

     if (!strcasecmp (item, "image")) {
        struct IMAGES **p = &images;

        while (*p)
             p = &((*p)->next);
        *p = (struct IMAGES *)malloc (sizeof (struct IMAGES));
        if (*p == NULL) {
             prom_printf("malloc error in cfg_set\n");
             return -1;
        }
        (*p)->next = 0;
        curr_table = ((*p)->table);
        memcpy (curr_table, cf_image, sizeof (cf_image));
     }
     for (walk = curr_table; walk->type != cft_end; walk++) {
        if (walk->name && !strcasecmp (walk->name, item)) {
             if (value && walk->type != cft_strg)
                cfg_warn ("'%s' doesn't have a value", walk->name);
             else if (!value && walk->type == cft_strg)
                cfg_warn ("Value expected for '%s'", walk->name);
             else {
                if (walk->data)
                   cfg_warn ("Duplicate entry '%s'", walk->name);
                if (walk->type == cft_flag)
                   walk->data = &flag_set;
                else if (walk->type == cft_strg)
                   walk->data = value;
             }
             break;
        }
     }
     if (walk->type != cft_end)
        return 1;
//    cfg_return (item, value);
     return 0;
}

int cfg_parse (char *cfg_file, char *buff, int len)
{
     char *item, *value;

     file_name = cfg_file;
     currp = buff;
     endp = currp + len;

     if (setjmp (env))
        return -1;
     while (1) {
        if (!cfg_next (&item, &value))
             return 0;
        if (!cfg_set (item, value)) {
#if DEBUG
             prom_printf("Can't set item %s to value %s\n", item, value);
#endif          
        }
        free (item);
     }
}

static char *cfg_get_strg_i (CONFIG * table, char *item)
{
     CONFIG *walk;

     for (walk = table; walk->type != cft_end; walk++)
        if (walk->name && !strcasecmp (walk->name, item))
             return walk->data;
     return 0;
}

char *cfg_get_strg (char *image, char *item)
{
     struct IMAGES *p;
     char *label, *alias;
     char *ret;

     if (!image)
        return cfg_get_strg_i (cf_options, item);
     for (p = images; p; p = p->next) {
        label = cfg_get_strg_i (p->table, "label");
        if (!label) {
             label = cfg_get_strg_i (p->table, "image");
             alias = strrchr (label, '/');
             if (alias)
                label = alias + 1;
        }
        alias = cfg_get_strg_i (p->table, "alias");
        if (!strcmp (label, image) || (alias && !strcmp (alias, image))) {
             ret = cfg_get_strg_i (p->table, item);
             if (!ret)
                ret = cfg_get_strg_i (cf_options, item);
             return ret;
        }
     }
     return 0;
}

int cfg_get_flag (char *image, char *item)
{
     return !!cfg_get_strg (image, item);
}

static int printl_count = 0;
static void printlabel (char *label, int defflag)
{
     int len = strlen (label);

     if (!printl_count)
        prom_printf ("\n");
     prom_printf ("%s %s",defflag?"*":" ", label);
     while (len++ < 25)
        prom_putchar (' ');
     printl_count++;
     if (printl_count == 3)
        printl_count = 0;
}

void cfg_print_images (void)
{
     struct IMAGES *p;
     char *label, *alias;

     char *ret = cfg_get_strg_i (cf_options, "default");
     int defflag=0;

     printl_count = 0;
     for (p = images; p; p = p->next) {
        label = cfg_get_strg_i (p->table, "label");
        if (!label) {
             label = cfg_get_strg_i (p->table, "image");
             alias = strrchr (label, '/');
             if (alias)
                label = alias + 1;
        }
        if(!strcmp(ret,label))
             defflag=1;
        else
             defflag=0;
        alias = cfg_get_strg_i (p->table, "alias");
        printlabel (label, defflag);
        if (alias)
             printlabel (alias, 0);
     }
     prom_printf("\n");
}

char *cfg_get_default (void)
{
     char *label;
     char *ret = cfg_get_strg_i (cf_options, "default");

     if (ret)
        return ret;
     if (!images)
        return 0;
     ret = cfg_get_strg_i (images->table, "label");
     if (!ret) {
        ret = cfg_get_strg_i (images->table, "image");
        label = strrchr (ret, '/');
        if (label)
             ret = label + 1;
     }
     return ret;
}

/* 
 * Local variables:
 * c-file-style: "k&r"
 * c-basic-offset: 5
 * End:
 */

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