Sweden-Number/tools/specmaker/search.c

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7.6 KiB
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/*
* Prototype search and parsing functions
*
* Copyright 2000 Jon Griffiths
*/
#include "specmaker.h"
static char *grep_buff = NULL;
static char *fgrep_buff = NULL;
static int symbol_from_prototype (parsed_symbol *sym, const char *prototype);
static const char *get_type (parsed_symbol *sym, const char *proto, int arg);
/*******************************************************************
* symbol_search
*
* Call Patrik Stridvall's 'function_grep.pl' script to retrieve a
* function prototype from include file(s)
*/
int symbol_search (parsed_symbol *sym)
{
static const size_t MAX_RESULT_LEN = 1024;
FILE *grep;
int attempt = 0;
assert (globals.do_code);
assert (globals.directory);
assert (sym && sym->symbol);
if (!symbol_is_valid_c (sym))
return - 1;
if (!grep_buff)
grep_buff = (char *) malloc (MAX_RESULT_LEN);
if (!fgrep_buff)
fgrep_buff = (char *) malloc (MAX_RESULT_LEN);
if (!grep_buff || !fgrep_buff)
fatal ("Out of Memory");
/* Use 'grep' to tell us which possible files the function is in,
* then use 'function_grep.pl' to get the prototype. If this fails the
* first time then give grep a more general query (that doesn't
* require an opening argument brace on the line with the function name).
*/
while (attempt < 2)
{
FILE *f_grep;
char *cmd = str_create (4, "grep -d recurse -l \"", sym->symbol,
!attempt ? "[:blank:]*(\" " : "\" ", globals.directory);
if (VERBOSE)
puts (cmd);
fflush (NULL); /* See 'man popen' */
if (!(grep = popen (cmd, "r")))
fatal ("Cannot execute grep -l");
free (cmd);
while (fgets (grep_buff, MAX_RESULT_LEN, grep))
{
int i;
for (i = 0; grep_buff[i] && grep_buff[i] != '\n' ; i++)
;
grep_buff[i] = '\0';
if (VERBOSE)
puts (grep_buff);
cmd = str_create (5, "function_grep.pl ", sym->symbol,
" \"", grep_buff, "\"");
if (VERBOSE)
puts (cmd);
fflush (NULL); /* See 'man popen' */
if (!(f_grep = popen (cmd, "r")))
fatal ("Cannot execute function_grep.pl");
free (cmd);
while (fgets (grep_buff, MAX_RESULT_LEN, f_grep))
{
char *iter = grep_buff;
/* Keep only the first line */
symbol_clean_string(grep_buff);
for (i = 0; grep_buff[i] && grep_buff[i] != '\n' ; i++)
;
grep_buff[i] = '\0';
if (VERBOSE)
puts (grep_buff);
while ((iter = strstr (iter, sym->symbol)))
{
if (iter > grep_buff && iter[-1] == ' ' &&
(iter[strlen (sym->symbol)] == ' ' ||
iter[strlen (sym->symbol)] == '('))
{
if (VERBOSE)
printf ("Prototype '%s' looks OK, processing\n", grep_buff);
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if (!symbol_from_prototype (sym, grep_buff))
{
pclose (f_grep);
pclose (grep);
return 0; /* OK */
}
if (VERBOSE)
puts ("Failed, trying next");
}
else
iter += strlen (sym->symbol);
}
}
pclose (f_grep);
}
pclose (grep);
attempt++;
}
return -1; /* Not found */
}
/*******************************************************************
* symbol_from_prototype
*
* Convert a C prototype into a symbol
*/
static int symbol_from_prototype (parsed_symbol *sym, const char *proto)
{
char *iter;
int found;
proto = get_type (sym, proto, -1); /* Get return type */
if (!proto)
return -1;
iter = (char *)str_match (proto, sym->symbol, &found);
if (!found)
{
char *call;
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/* Calling Convention */
iter = strchr (iter, ' ');
if (!iter)
return -1;
call = str_substring (proto, iter);
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if (!strcasecmp (call, "cdecl") || !strcasecmp (call, "__cdecl"))
sym->flags |= SYM_CDECL;
else
sym->flags |= SYM_STDCALL;
free (call);
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iter = (char *)str_match (iter, sym->symbol, &found);
if (!found)
return -1;
if (VERBOSE)
printf ("Using %s calling convention\n",
sym->flags & SYM_CDECL ? "cdecl" : "stdcall");
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}
else
sym->flags = CALLING_CONVENTION;
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sym->function_name = strdup (sym->symbol);
proto = iter;
/* Now should be the arguments */
if (*proto++ != '(')
return -1;
for (; *proto == ' '; proto++);
if (!strncmp (proto, "void", 4))
return 0;
do
{
/* Process next argument */
str_match (proto, "...", &sym->varargs);
if (sym->varargs)
return 0;
if (!(proto = get_type (sym, proto, sym->argc)))
return -1;
sym->argc++;
if (*proto == ',')
proto++;
else if (*proto != ')')
return -1;
} while (*proto != ')');
return 0;
}
/*******************************************************************
* get_type
*
* Read a type from a prototype
*/
static const char *get_type (parsed_symbol *sym, const char *proto, int arg)
{
int is_const, is_volatile, is_struct, is_signed, is_unsigned, ptrs = 0;
char *iter, *type_str, *base_type, *catch_unsigned, dest_type;
assert (sym && sym->symbol);
assert (proto && *proto);
assert (arg < 0 || (unsigned)arg == sym->argc);
type_str = (char *)proto;
proto = str_match (proto, "const", &is_const);
proto = str_match (proto, "volatile", &is_volatile);
proto = str_match (proto, "struct", &is_struct);
if (!is_struct)
proto = str_match (proto, "union", &is_struct);
catch_unsigned = (char *)proto;
proto = str_match (proto, "unsigned", &is_unsigned);
proto = str_match (proto, "signed", &is_signed);
/* Can have 'unsigned const' or 'const unsigned' etc */
if (!is_const)
proto = str_match (proto, "const", &is_const);
if (!is_volatile)
proto = str_match (proto, "volatile", &is_volatile);
base_type = (char *)proto;
iter = (char *)str_find_set (proto, " ,*)");
if (!iter)
return NULL;
if (arg < 0 && (is_signed || is_unsigned))
{
/* Prevent calling convention from being swallowed by 'un/signed' alone */
if (strncmp (base_type, "int", 3) && strncmp (base_type, "long", 4) &&
strncmp (base_type, "short", 5) && strncmp (base_type, "char", 4))
{
iter = (char *)proto;
base_type = catch_unsigned;
}
}
else
catch_unsigned = NULL;
/* FIXME: skip const/volatile here too */
for (proto = iter; *proto; proto++)
if (*proto == '*')
ptrs++;
else if (*proto != ' ')
break;
if (!*proto)
return NULL;
type_str = str_substring (type_str, proto);
if (iter == base_type || catch_unsigned)
{
/* 'unsigned' with no type */
char *tmp = str_create (2, type_str, " int");
free (type_str);
type_str = tmp;
}
symbol_clean_string (type_str);
dest_type = symbol_get_type (type_str);
if (arg < 0)
{
sym->return_text = type_str;
sym->return_type = dest_type;
}
else
{
sym->arg_type [arg] = dest_type;
sym->arg_flag [arg] = is_const ? CT_CONST : is_volatile ? CT_VOLATILE : 0;
if (*proto == ',' || *proto == ')')
sym->arg_name [arg] = str_create_num (1, arg, "arg");
else
{
iter = (char *)str_find_set (proto, " ,)");
if (!iter)
{
free (type_str);
return NULL;
}
sym->arg_name [arg] = str_substring (proto, iter);
proto = iter;
}
sym->arg_text [arg] = type_str;
}
return proto;
}
#ifdef __GNUC__
/*******************************************************************
* search_cleanup
*
* Free memory used while searching (a niceity)
*/
void search_cleanup (void) __attribute__ ((destructor));
void search_cleanup (void)
{
if (grep_buff)
free (grep_buff);
if (fgrep_buff)
free (fgrep_buff);
}
#endif