ppbuiltin.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1986-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* preprocessor builtin macro support
*/
#include "pplib.h"
#include <times.h>
/*
* process a #(...) builtin macro call
* `#(' has already been seen
*/
void
ppbuiltin(void)
{
register int c;
register char* p;
register char* a;
int n;
int op;
char* token;
char* t;
long number;
long onumber;
struct ppinstk* in;
struct pplist* list;
struct ppsymbol* sym;
Sfio_t* sp;
number = pp.state;
pp.state |= DISABLE|FILEPOP|NOSPACE;
token = pp.token;
p = pp.token = pp.tmpbuf;
*(a = pp.args) = 0;
if ((c = pplex()) != T_ID)
{
error(2, "%s: #(<identifier>...) expected", p);
*p = 0;
}
switch (op = (int)hashget(pp.strtab, p))
{
case V_DEFAULT:
n = 0;
p = pp.token = pp.valbuf;
if ((c = pplex()) == ',')
{
op = -1;
c = pplex();
}
pp.state &= ~NOSPACE;
for (;;)
{
if (!c)
{
error(2, "%s in #(...) argument", pptokchr(c));
break;
}
if (c == '(') n++;
else if (c == ')' && !n--) break;
else if (c == ',' && !n && op > 0) op = 0;
if (op) pp.token = pp.toknxt;
c = pplex();
}
*pp.token = 0;
pp.token = token;
pp.state = number;
break;
case V_EMPTY:
p = pp.valbuf;
if ((c = pplex()) == ')') *p = '1';
else
{
*p = '0';
n = 0;
for (;;)
{
if (!c)
{
error(2, "%s in #(...) argument", pptokchr(c));
break;
}
if (c == '(') n++;
else if (c == ')' && !n--) break;
c = pplex();
}
}
*(p + 1) = 0;
pp.token = token;
pp.state = number;
break;
case V_ITERATE:
n = 0;
pp.token = pp.valbuf;
if ((c = pplex()) != T_ID || !(sym = ppsymref(pp.symtab, pp.token)) || !sym->macro || sym->macro->arity != 1 || (c = pplex()) != ',')
{
error(2, "#(%s <macro(x)>, ...) expected", p);
for (;;)
{
if (!c)
{
error(2, "%s in #(...) argument", pptokchr(c));
break;
}
if (c == '(') n++;
else if (c == ')' && !n--) break;
c = pplex();
}
*pp.valbuf = 0;
}
else while (c != ')')
{
p = pp.token;
if (pp.token > pp.valbuf) *pp.token++ = ' ';
STRCOPY(pp.token, sym->name, a);
*pp.token++ = '(';
if (!c || !(c = pplex()))
{
pp.token = p;
error(2, "%s in #(...) argument", pptokchr(c));
break;
}
pp.state &= ~NOSPACE;
while (c)
{
if (c == '(') n++;
else if (c == ')' && !n--) break;
else if (c == ',' && !n) break;
pp.token = pp.toknxt;
c = pplex();
}
*pp.token++ = ')';
pp.state |= NOSPACE;
}
p = pp.valbuf;
pp.token = token;
pp.state = number;
break;
default:
pp.token = token;
while (c != ')')
{
if (!c)
{
error(2, "%s in #(...) argument", pptokchr(c));
break;
}
if ((c = pplex()) == T_ID && !*a)
strcpy(a, pp.token);
}
pp.state = number;
switch (op)
{
case V_ARGC:
c = -1;
for (in = pp.in; in; in = in->prev)
if ((in->type == IN_MACRO || in->type == IN_MULTILINE) && (in->symbol->flags & SYM_FUNCTION))
{
c = *((unsigned char*)(pp.macp->arg[0] - 2));
break;
}
sfsprintf(p = pp.valbuf, MAXTOKEN, "%d", c);
break;
case V_BASE:
p = (a = strrchr(error_info.file, '/')) ? a + 1 : error_info.file;
break;
case V_DATE:
if (!(p = pp.date))
{
time_t tm;
time(&tm);
a = p = ctime(&tm) + 4;
*(p + 20) = 0;
for (p += 7; *p = *(p + 9); p++);
pp.date = p = strdup(a);
}
break;
case V_FILE:
p = error_info.file;
break;
case V_LINE:
sfsprintf(p = pp.valbuf, MAXTOKEN, "%d", error_info.line);
break;
case V_PATH:
p = pp.path;
break;
case V_SOURCE:
p = error_info.file;
for (in = pp.in; in->prev; in = in->prev)
if (in->prev->type == IN_FILE && in->file)
p = in->file;
break;
case V_STDC:
p = pp.valbuf;
p[0] = ((pp.state & (COMPATIBILITY|TRANSITION)) || (pp.mode & (HOSTED|HOSTEDTRANSITION)) == (HOSTED|HOSTEDTRANSITION)) ? '0' : '1';
p[1] = 0;
break;
case V_TIME:
if (!(p = pp.time))
{
time_t tm;
time(&tm);
p = ctime(&tm) + 11;
*(p + 8) = 0;
pp.time = p = strdup(p);
}
break;
case V_VERSION:
p = (char*)pp.version;
break;
case V_DIRECTIVE:
pp.state |= NEWLINE;
pp.mode |= RELAX;
strcpy(p = pp.valbuf, "#");
break;
case V_GETENV:
if (!(p = getenv(a))) p = "";
break;
case V_GETMAC:
p = (sym = pprefmac(a, REF_NORMAL)) ? sym->macro->value : "";
break;
case V_GETOPT:
sfsprintf(p = pp.valbuf, MAXTOKEN, "%ld", ppoption(a));
break;
case V_GETPRD:
p = (list = (struct pplist*)hashget(pp.prdtab, a)) ? list->value : "";
break;
case V__PRAGMA:
if ((c = pplex()) == '(')
{
number = pp.state;
pp.state |= NOSPACE|STRIP;
c = pplex();
pp.state = number;
if (c == T_STRING || c == T_WSTRING)
{
if (!(sp = sfstropen()))
error(3, "temporary buffer allocation error");
sfprintf(sp, "#%s %s\n", dirname(PRAGMA), pp.token);
a = sfstruse(sp);
if ((c = pplex()) == ')')
{
pp.state |= NEWLINE;
PUSH_BUFFER(p, a, 1);
}
sfstrclose(sp);
}
}
if (c != ')')
error(2, "%s: (\"...\") expected", p);
return;
case V_FUNCTION:
#define BACK(a,p) ((a>p)?*--a:(number++?0:((p=pp.outbuf+PPBUFSIZ),(a=pp.outbuf+2*PPBUFSIZ),*--a)))
#define PEEK(a,p) ((a>p)?*(a-1):(number?0:*(pp.outbuf+2*PPBUFSIZ-1)))
number = pp.outbuf != pp.outb;
a = pp.outp;
p = pp.outb;
op = 0;
while (c = BACK(a, p))
{
if (c == '"' || c == '\'')
{
op = 0;
while ((n = BACK(a, p)) && n != c || PEEK(a, p) == '\\');
}
else if (c == '\n')
{
token = a;
while (c = BACK(a, p))
if (c == '\n')
{
a = token;
break;
}
else if (c == '#' && PEEK(a, p) == '\n')
break;
}
else if (c == ' ')
/*ignore*/;
else if (c == '{') /* '}' */
op = 1;
else if (op == 1)
{
if (c == ')')
{
op = 2;
n = 1;
}
else
op = 0;
}
else if (op == 2)
{
if (c == ')')
n++;
else if (c == '(' && !--n)
op = 3;
}
else if (op == 3)
{
if (ppisidig(c))
{
for (t = p, token = a, onumber = number; ppisidig(PEEK(a, p)) && a >= p; BACK(a, p));
p = pp.valbuf + 1;
if (a > token)
{
for (; a < pp.outbuf+2*PPBUFSIZ; *p++ = *a++);
a = pp.outbuf;
}
for (; a <= token; *p++ = *a++);
*p = 0;
p = pp.valbuf + 1;
if (streq(p, "for") || streq(p, "if") || streq(p, "switch") || streq(p, "while"))
{
op = 0;
p = t;
number = onumber;
continue;
}
}
else
op = 0;
break;
}
}
if (op == 3)
p = strncpy(pp.funbuf, p, sizeof(pp.funbuf) - 1);
else if (*pp.funbuf)
p = pp.funbuf;
else
p = "__FUNCTION__";
break;
default:
if (pp.builtin && (a = (*pp.builtin)(pp.valbuf, p, a)))
p = a;
break;
}
break;
}
if (strchr(p, MARK))
{
a = pp.tmpbuf;
strcpy(a, p);
c = p != pp.valbuf;
p = pp.valbuf + c;
for (;;)
{
if (p < pp.valbuf + MAXTOKEN - 2)
switch (*p++ = *a++)
{
case 0:
break;
case MARK:
*p++ = MARK;
/*FALLTHROUGH*/
default:
continue;
}
break;
}
p = pp.valbuf + c;
}
if (p == pp.valbuf)
PUSH_STRING(p);
else
{
if (p == pp.valbuf + 1)
*pp.valbuf = '"';
else
{
if (strlen(p) > MAXTOKEN - 2)
error(1, "%-.16s: builtin value truncated", p);
sfsprintf(pp.valbuf, MAXTOKEN, "\"%-.*s", MAXTOKEN - 2, p);
}
PUSH_QUOTE(pp.valbuf, 1);
}
}