/* parser config.in
*
* Version 1.0
* Eric Youngdale
* 10/95
*
* The general idea here is that we want to parse a config.in file and
* from this, we generate a wish script which gives us effectively the
* same functionality that the original config.in script provided.
*
* This task is split roughly into 3 parts. The first parse is the parse
* of the input file itself. The second part is where we analyze the
* #ifdef clauses, and attach a linked list of tokens to each of the
* menu items. In this way, each menu item has a complete list of
* dependencies that are used to enable/disable the options.
* The third part is to take the configuration database we have build,
* and build the actual wish script.
*
* This file contains the code to do the first parse of config.in.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "tkparse.h"
struct kconfig * config = NULL;
struct kconfig * clast = NULL;
struct kconfig * koption = NULL;
static int lineno = 0;
static int menus_seen = 0;
static char * current_file = NULL;
static int do_source(char * filename);
static char * get_string(char *pnt, char ** labl);
static int choose_number = 0;
/*
* Simple function just to skip over spaces and tabs in config.in.
*/
static char * skip_whitespace(char * pnt)
{
while( *pnt && (*pnt == ' ' || *pnt == '\t')) pnt++;
return pnt;
}
/*
* This function parses a conditional from a config.in (i.e. from an ifdef)
* and generates a linked list of tokens that describes the conditional.
*/
static struct condition * parse_if(char * pnt)
{
char * opnt;
struct condition *list;
struct condition *last;
struct condition *cpnt;
char varname[64];
char * pnt1;
opnt = pnt;
/*
* We need to find the various tokens, and build the linked list.
*/
pnt = skip_whitespace(pnt);
if( *pnt != '[' ) return NULL;
pnt++;
pnt = skip_whitespace(pnt);
list = last = NULL;
while(*pnt && *pnt != ']') {
pnt = skip_whitespace(pnt);
if(*pnt== '\0' || *pnt == ']') break;
/*
* Allocate memory for the token we are about to parse, and insert
* it in the linked list.
*/
cpnt = (struct condition *) malloc(sizeof(struct condition));
memset(cpnt, 0, sizeof(struct condition));
if( last == NULL )
{
list = last = cpnt;
}
else
{
last->next = cpnt;
last = cpnt;
}
/*
* Determine what type of operation this token represents.
*/
if( *pnt == '-' && pnt[1] == 'a' )
{
cpnt->op = op_and;
pnt += 2;
continue;
}
if( *pnt == '-' && pnt[1] == 'o' )
{
cpnt->op = op_or;
pnt += 2;
continue;
}
if( *pnt == '!' && pnt[1] == '=' )
{
cpnt->op = op_neq;
pnt += 2;
continue;
}
if( *pnt == '=')
{
cpnt->op = op_eq;
pnt += 1;
continue;
}
if( *pnt == '!')
{
cpnt->op = op_bang;
pnt += 1;
continue;
}
if( *pnt != '"' ) goto error; /* This cannot be right. */
pnt++;
if( *pnt == '`' )
{
cpnt->op = op_shellcmd;
pnt1 = varname;
pnt++;
while(*pnt && *pnt != '`') *pnt1++ = *pnt++;
*pnt1++ = '\0';
cpnt->variable.str = strdup(varname);
if( *pnt == '`' ) pnt++;
if( *pnt == '"' ) pnt++;
continue;
}
if( *pnt == '$' )
{
cpnt->op = op_variable;
pnt1 = varname;
pnt++;
while(*pnt && *pnt != '"') *pnt1++ = *pnt++;
*pnt1++ = '\0';
cpnt->variable.str = strdup(varname);
if( *pnt == '"' ) pnt++;
continue;
}
cpnt->op = op_constant;
pnt1 = varname;
while(*pnt && *pnt != '"') *pnt1++ = *pnt++;
*pnt1++ = '\0';
cpnt->variable.str = strdup(varname);
if( *pnt == '"' ) pnt++;
continue;
}
return list;
error:
if(current_file != NULL)
fprintf(stderr,
"Bad if clause at line %d(%s):%s\n", lineno, current_file, opnt);
else
fprintf(stderr,
"Bad if clause at line %d:%s\n", lineno, opnt);
return NULL;
}
/*
* This function looks for a quoted string, from the input buffer, and
* returns a pointer to a copy of this string. Any characters in
* the string that need to be "quoted" have a '\' character inserted
* in front - this way we can directly write these strings into
* wish scripts.
*/
static char * get_qstring(char *pnt, char ** labl)
{
char quotechar;
char newlabel[1024];
char * pnt1;
char * pnt2;
while( *pnt && *pnt != '"' && *pnt != '\'') pnt++;
if (*pnt == '\0') return pnt;
quotechar = *pnt++;
pnt1 = newlabel;
while(*pnt && *pnt != quotechar && pnt[-1] != '\\')
{
/*
* Quote the character if we need to.
*/
if( *pnt == '"' || *pnt == '\'' || *pnt == '[' || *pnt == ']')
*pnt1++ = '\\';
*pnt1++ = *pnt++;
}
*pnt1++ = '\0';
pnt2 = (char *) malloc(strlen(newlabel) + 1);
strcpy(pnt2, newlabel);
*labl = pnt2;
/*
* Skip over last quote, and whitespace.
*/
pnt++;
pnt = skip_whitespace(pnt);
return pnt;
}
static char * parse_choices(struct kconfig * choice_kcfg, char * pnt)
{
struct kconfig * kcfg;
int index = 1;
/*
* Choices appear in pairs of strings. The parse is fairly trivial.
*/
while(1)
{
pnt = skip_whitespace(pnt);
if(*pnt == '\0') break;
kcfg = (struct kconfig *) malloc(sizeof(struct kconfig));
memset(kcfg, 0, sizeof(struct kconfig));
kcfg->tok = tok_choice;
if( clast != NULL )
{
clast->next = kcfg;
clast = kcfg;
}
else
{
clast = config = kcfg;
}
pnt = get_string(pnt, &kcfg->label);
pnt = skip_whitespace(pnt);
pnt = get_string(pnt, &kcfg->optionname);
kcfg->choice_label = choice_kcfg;
kcfg->choice_value = index++;
if( strcmp(kcfg->label, choice_kcfg->value) == 0 )
choice_kcfg->choice_value = kcfg->choice_value;
}
return pnt;
}
/*
* This function grabs one text token from the input buffer
* and returns a pointer to a copy of just the identifier.
* This can be either a variable name (i.e. CONFIG_NET),
* or it could be the default value for the option.
*/
static char * get_string(char *pnt, char ** labl)
{
char newlabel[1024];
char * pnt1;
char * pnt2;
if (*pnt == '\0') return pnt;
pnt1 = newlabel;
while(*pnt && *pnt != ' ' && *pnt != '\t')
{
*pnt1++ = *pnt++;
}
*pnt1++ = '\0';
pnt2 = (char *) malloc(strlen(newlabel) + 1);
strcpy(pnt2, newlabel);
*labl = pnt2;
if( *pnt ) pnt++;
return pnt;
}
/*
* Top level parse function. Input pointer is one complete line from config.in
* and the result is that we create a token that describes this line
* and insert it into our linked list.
*/
void parse(char * pnt) {
enum token tok;
struct kconfig * kcfg;
char tmpbuf[24],fake_if[1024];
/*
* Ignore comments and leading whitespace.
*/
pnt = skip_whitespace(pnt);
while( *pnt && (*pnt == ' ' || *pnt == '\t')) pnt++;
if(! *pnt ) return;
if( *pnt == '#' ) return;
/*
* Now categorize the next token.
*/
tok = tok_unknown;
if (strncmp(pnt, "mainmenu_name", 13) == 0)
{
tok = tok_menuname;
pnt += 13;
}
else if (strncmp(pnt, "source", 6) == 0)
{
pnt += 7;
pnt = skip_whitespace(pnt);
do_source(pnt);
return;
}
else if (strncmp(pnt, "mainmenu_option", 15) == 0)
{
menus_seen++;
tok = tok_menuoption;
pnt += 15;
}
else if (strncmp(pnt, "$MAKE ", 6) == 0)
{
tok = tok_make;
}
else if (strncmp(pnt, "comment", 7) == 0)
{
tok = tok_comment;
pnt += 7;
}
else if (strncmp(pnt, "choice", 6) == 0)
{
tok = tok_choose;
pnt += 6;
}
else if (strncmp(pnt, "define_bool", 11) == 0)
{
tok = tok_define;
pnt += 11;
}
else if (strncmp(pnt, "bool", 4) == 0)
{
tok = tok_bool;
pnt += 4;
}
else if (strncmp(pnt, "tristate", 8) == 0)
{
tok = tok_tristate;
pnt += 8;
}
else if (strncmp(pnt, "dep_tristate", 12) == 0)
{
tok = tok_dep_tristate;
pnt += 12;
}
else if (strncmp(pnt, "int", 3) == 0)
{
tok = tok_int;
pnt += 3;
}
else if (strncmp(pnt, "hex", 3) == 0)
{
tok = tok_hex;
pnt += 3;
}
else if (strncmp(pnt, "if", 2) == 0)
{
tok = tok_if;
pnt += 2;
}
else if (strncmp(pnt, "else", 4) == 0)
{
tok = tok_else;
pnt += 4;
}
else if (strncmp(pnt, "fi", 2) == 0)
{
tok = tok_fi;
pnt += 2;
}
else if (strncmp(pnt, "endmenu", 7) == 0)
{
tok = tok_endmenu;
pnt += 7;
}
if( tok == tok_unknown)
{
if( clast != NULL && clast->tok == tok_if
&& strcmp(pnt,"then") == 0) return;
if( current_file != NULL )
fprintf(stderr, "unknown command=%s(%s %d)\n", pnt,
current_file, lineno);
else
fprintf(stderr, "unknown command=%s(%d)\n", pnt,lineno);
return;
}
/*
* Allocate memory for this item, and attach it to the end of the linked
* list.
*/
kcfg = (struct kconfig *) malloc(sizeof(struct kconfig));
memset(kcfg, 0, sizeof(struct kconfig));
kcfg->tok = tok;
if( clast != NULL )
{
clast->next = kcfg;
clast = kcfg;
}
else
{
clast = config = kcfg;
}
pnt = skip_whitespace(pnt);
/*
* Now parse the remaining parts of the option, and attach the results
* to the structure.
*/
switch (tok)
{
case tok_choose:
pnt = get_qstring(pnt, &kcfg->label);
pnt = get_qstring(pnt, &kcfg->optionname);
pnt = get_string(pnt, &kcfg->value);
/*
* Now we need to break apart the individual options into their
* own configuration structures.
*/
parse_choices(kcfg, kcfg->optionname);
free(kcfg->optionname);
sprintf(tmpbuf, "tmpvar_%d", choose_number++);
kcfg->optionname = strdup(tmpbuf);
break;
case tok_define:
pnt = get_string(pnt, &kcfg->optionname);
if(*pnt == 'y' || *pnt == 'Y' ) kcfg->value = "1";
if(*pnt == 'n' || *pnt == 'N' ) kcfg->value = "0";
if(*pnt == 'm' || *pnt == 'M' ) kcfg->value = "2";
break;
case tok_menuname:
pnt = get_qstring(pnt, &kcfg->label);
break;
case tok_bool:
case tok_tristate:
pnt = get_qstring(pnt, &kcfg->label);
pnt = get_string(pnt, &kcfg->optionname);
break;
case tok_int:
case tok_hex:
pnt = get_qstring(pnt, &kcfg->label);
pnt = get_string(pnt, &kcfg->optionname);
pnt = get_string(pnt, &kcfg->value);
break;
case tok_dep_tristate:
pnt = get_qstring(pnt, &kcfg->label);
pnt = get_string(pnt, &kcfg->optionname);
pnt = skip_whitespace(pnt);
if( *pnt == '$') pnt++;
pnt = get_string(pnt, &kcfg->depend.str);
/*
* Create a conditional for this object's dependency.
*
* We can't use "!= n" because this is internally converted to "!= 0"
* and if UMSDOS depends on MSDOS which depends on FAT, then when FAT
* is disabled MSDOS has 16 added to its value, making UMSDOS fully
* available. Whew.
*
* This is more of a hack than a fix. Nested "if" conditionals are
* probably affected too - that +/- 16 affects things in too many
* places. But this should do for now.
*/
sprintf(fake_if,"[ \"$%s\" = \"y\" -o \"$%s\" = \"m\" ]; then",
kcfg->depend.str,kcfg->depend.str);
kcfg->cond = parse_if(fake_if);
if(kcfg->cond == NULL )
{
exit(1);
}
break;
case tok_comment:
pnt = get_qstring(pnt, &kcfg->label);
if( koption != NULL )
{
pnt = get_qstring(pnt, &kcfg->label);
koption->label = kcfg->label;
koption = NULL;
}
break;
case tok_menuoption:
if( strncmp(pnt, "next_comment", 12) == 0)
{
koption = kcfg;
}
else
{
pnt = get_qstring(pnt, &kcfg->label);
}
break;
case tok_make:
kcfg->value=strdup(pnt);
break;
case tok_else:
case tok_fi:
case tok_endmenu:
break;
case tok_if:
/*
* Conditionals are different. For the first level parse, only
* tok_if and tok_dep_tristate items have a ->cond chain attached.
*/
kcfg->cond = parse_if(pnt);
if(kcfg->cond == NULL )
{
exit(1);
}
break;
default:
exit(0);
}
return;
}
/*
* Simple function to dump to the screen what the condition chain looks like.
*/
void dump_if(struct condition * cond)
{
printf(" ");
while(cond != NULL )
{
switch(cond->op){
case op_eq:
printf(" = ");
break;
case op_bang:
printf(" ! ");
break;
case op_neq:
printf(" != ");
break;
case op_and:
printf(" -a ");
break;
case op_lparen:
printf("(");
break;
case op_rparen:
printf(")");
break;
case op_variable:
printf("$%s", cond->variable.str);
break;
case op_constant:
printf("'%s'", cond->variable.str);
break;
default:
break;
}
cond = cond->next;
}
printf("\n");
}
static int do_source(char * filename)
{
char buffer[1024];
int offset;
int old_lineno;
char * old_file;
char * pnt;
FILE * infile;
if( strcmp(filename, "-") == 0 )
infile = stdin;
else
infile = fopen(filename,"r");
/*
* If our cwd was in the scripts directory, we might have to go up one
* to find the sourced file.
*/
if(!infile) {
strcpy (buffer, "../");
strcat (buffer, filename);
infile = fopen(buffer,"r");
}
if(!infile) {
fprintf(stderr,"Unable to open file %s\n", filename);
return 1;
}
old_lineno = lineno;
lineno = 0;
if( infile != stdin ) {
old_file = current_file;
current_file = filename;
}
offset = 0;
while(1)
{
fgets(&buffer[offset], sizeof(buffer) - offset, infile);
if(feof(infile)) break;
/*
* Strip the trailing return character.
*/
pnt = buffer + strlen(buffer) - 1;
if( *pnt == '\n') *pnt-- = 0;
lineno++;
if( *pnt == '\\' )
{
offset = pnt - buffer;
}
else
{
parse(buffer);
offset = 0;
}
}
fclose(infile);
if( infile != stdin ) {
current_file = old_file;
}
lineno = old_lineno;
return 0;
}
int main(int argc, char * argv[])
{
#if 0
char buffer[1024];
char * pnt;
struct kconfig * cfg;
int i;
#endif
/*
* Read stdin to get the top level script.
*/
do_source("-");
if( menus_seen == 0 )
{
fprintf(stderr,"The config.in file for this platform does not support\n");
fprintf(stderr,"menus.\n");
exit(1);
}
/*
* Input file is now parsed. Next we need to go through and attach
* the correct conditions to each of the actual menu items and kill
* the if/else/endif tokens from the list. We also flag the menu items
* that have other things that depend upon its setting.
*/
fix_conditionals(config);
/*
* Finally, we generate the wish script.
*/
dump_tk_script(config);
#if 0
/*
* Now dump what we have so far. This is only for debugging so that
* we can display what we think we have in the list.
*/
for(cfg = config; cfg; cfg = cfg->next)
{
if(cfg->cond != NULL && cfg->tok != tok_if)
dump_if(cfg->cond);
switch(cfg->tok)
{
case tok_menuname:
printf("main_menuname ");
break;
case tok_bool:
printf("bool ");
break;
case tok_tristate:
printf("tristate ");
break;
case tok_dep_tristate:
printf("dep_tristate ");
break;
case tok_int:
printf("int ");
break;
case tok_hex:
printf("hex ");
break;
case tok_comment:
printf("comment ");
break;
case tok_menuoption:
printf("menuoption ");
break;
case tok_else:
printf("else");
break;
case tok_fi:
printf("fi");
break;
case tok_if:
printf("if");
break;
default:
}
switch(cfg->tok)
{
case tok_menuoption:
case tok_comment:
case tok_menuname:
printf("%s\n", cfg->label);
break;
case tok_bool:
case tok_tristate:
case tok_dep_tristate:
case tok_int:
case tok_hex:
printf("%s %s\n", cfg->label, cfg->optionname);
break;
case tok_if:
dump_if(cfg->cond);
break;
case tok_nop:
case tok_endmenu:
break;
default:
printf("\n");
}
}
#endif
return 0;
}
