468 lines
8.9 KiB
C
468 lines
8.9 KiB
C
/*
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* node.c -- routines for node management
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*/
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/*
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* Copyright (C) 1986, 1988, 1989, 1991-1995 the Free Software Foundation, Inc.
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*
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* This file is part of GAWK, the GNU implementation of the
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* AWK Progamming Language.
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*
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* GAWK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GAWK is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GAWK; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "awk.h"
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extern double strtod();
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AWKNUM
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r_force_number(n)
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register NODE *n;
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{
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register char *cp;
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register char *cpend;
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char save;
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char *ptr;
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unsigned int newflags;
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#ifdef DEBUG
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if (n == NULL)
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cant_happen();
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if (n->type != Node_val)
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cant_happen();
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if(n->flags == 0)
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cant_happen();
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if (n->flags & NUM)
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return n->numbr;
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#endif
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/* all the conditionals are an attempt to avoid the expensive strtod */
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n->numbr = 0.0;
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n->flags |= NUM;
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if (n->stlen == 0)
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return 0.0;
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cp = n->stptr;
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if (isalpha(*cp))
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return 0.0;
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cpend = cp + n->stlen;
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while (cp < cpend && isspace(*cp))
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cp++;
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if (cp == cpend || isalpha(*cp))
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return 0.0;
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if (n->flags & MAYBE_NUM) {
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newflags = NUMBER;
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n->flags &= ~MAYBE_NUM;
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} else
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newflags = 0;
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if (cpend - cp == 1) {
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if (isdigit(*cp)) {
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n->numbr = (AWKNUM)(*cp - '0');
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n->flags |= newflags;
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}
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return n->numbr;
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}
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errno = 0;
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save = *cpend;
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*cpend = '\0';
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n->numbr = (AWKNUM) strtod((const char *)cp, &ptr);
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/* POSIX says trailing space is OK for NUMBER */
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while (isspace(*ptr))
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ptr++;
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*cpend = save;
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/* the >= should be ==, but for SunOS 3.5 strtod() */
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if (errno == 0 && ptr >= cpend)
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n->flags |= newflags;
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else
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errno = 0;
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return n->numbr;
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}
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/*
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* the following lookup table is used as an optimization in force_string
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* (more complicated) variations on this theme didn't seem to pay off, but
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* systematic testing might be in order at some point
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*/
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static const char *values[] = {
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"0",
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"1",
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"2",
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"3",
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"4",
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"5",
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"6",
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"7",
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"8",
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"9",
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};
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#define NVAL (sizeof(values)/sizeof(values[0]))
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NODE *
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r_force_string(s)
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register NODE *s;
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{
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char buf[128];
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register char *sp = buf;
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double val;
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#ifdef DEBUG
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if (s == NULL) cant_happen();
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if (s->type != Node_val) cant_happen();
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if ((s->flags & STR) && (s->stfmt == -1 || s->stfmt == CONVFMTidx)) return s;
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if (!(s->flags & NUM)) cant_happen();
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if (s->stref != 0) ; /*cant_happen();*/
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#endif
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/* not an integral value, or out of range */
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if ((val = double_to_int(s->numbr)) != s->numbr
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|| val < LONG_MIN || val > LONG_MAX) {
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#ifdef GFMT_WORKAROUND
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NODE *dummy, *r;
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unsigned short oflags;
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extern NODE *format_tree P((const char *, int, NODE *));
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extern NODE **fmt_list; /* declared in eval.c */
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/* create dummy node for a sole use of format_tree */
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getnode(dummy);
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dummy->lnode = s;
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dummy->rnode = NULL;
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oflags = s->flags;
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s->flags |= PERM; /* prevent from freeing by format_tree() */
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r = format_tree(CONVFMT, fmt_list[CONVFMTidx]->stlen, dummy);
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s->flags = oflags;
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s->stfmt = (char)CONVFMTidx;
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s->stlen = r->stlen;
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s->stptr = r->stptr;
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freenode(r); /* Do not free_temp(r)! We want */
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freenode(dummy); /* to keep s->stptr == r->stpr. */
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goto no_malloc;
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#else
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/*
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* no need for a "replacement" formatting by gawk,
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* just use sprintf
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*/
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sprintf(sp, CONVFMT, s->numbr);
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s->stlen = strlen(sp);
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s->stfmt = (char)CONVFMTidx;
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#endif /* GFMT_WORKAROUND */
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} else {
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/* integral value */
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/* force conversion to long only once */
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register long num = (long) val;
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if (num < NVAL && num >= 0) {
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sp = (char *) values[num];
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s->stlen = 1;
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} else {
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(void) sprintf(sp, "%ld", num);
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s->stlen = strlen(sp);
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}
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s->stfmt = -1;
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}
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emalloc(s->stptr, char *, s->stlen + 2, "force_string");
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memcpy(s->stptr, sp, s->stlen+1);
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no_malloc:
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s->stref = 1;
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s->flags |= STR;
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return s;
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}
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/*
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* Duplicate a node. (For strings, "duplicate" means crank up the
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* reference count.)
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*/
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NODE *
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dupnode(n)
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NODE *n;
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{
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register NODE *r;
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if (n->flags & TEMP) {
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n->flags &= ~TEMP;
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n->flags |= MALLOC;
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return n;
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}
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if ((n->flags & (MALLOC|STR)) == (MALLOC|STR)) {
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if (n->stref < 255)
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n->stref++;
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return n;
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}
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getnode(r);
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*r = *n;
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r->flags &= ~(PERM|TEMP);
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r->flags |= MALLOC;
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if (n->type == Node_val && (n->flags & STR)) {
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r->stref = 1;
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emalloc(r->stptr, char *, r->stlen + 2, "dupnode");
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memcpy(r->stptr, n->stptr, r->stlen);
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r->stptr[r->stlen] = '\0';
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}
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return r;
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}
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/* this allocates a node with defined numbr */
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NODE *
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mk_number(x, flags)
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AWKNUM x;
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unsigned int flags;
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{
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register NODE *r;
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getnode(r);
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r->type = Node_val;
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r->numbr = x;
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r->flags = flags;
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#ifdef DEBUG
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r->stref = 1;
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r->stptr = 0;
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r->stlen = 0;
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#endif
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return r;
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}
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/*
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* Make a string node.
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*/
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NODE *
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make_str_node(s, len, flags)
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char *s;
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size_t len;
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int flags;
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{
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register NODE *r;
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getnode(r);
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r->type = Node_val;
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r->flags = (STRING|STR|MALLOC);
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if (flags & ALREADY_MALLOCED)
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r->stptr = s;
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else {
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emalloc(r->stptr, char *, len + 2, s);
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memcpy(r->stptr, s, len);
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}
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r->stptr[len] = '\0';
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if (flags & SCAN) { /* scan for escape sequences */
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char *pf;
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register char *ptm;
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register int c;
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register char *end;
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end = &(r->stptr[len]);
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for (pf = ptm = r->stptr; pf < end;) {
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c = *pf++;
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if (c == '\\') {
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c = parse_escape(&pf);
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if (c < 0) {
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if (do_lint)
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warning("backslash at end of string");
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c = '\\';
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}
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*ptm++ = c;
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} else
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*ptm++ = c;
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}
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len = ptm - r->stptr;
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erealloc(r->stptr, char *, len + 1, "make_str_node");
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r->stptr[len] = '\0';
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r->flags |= PERM;
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}
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r->stlen = len;
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r->stref = 1;
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r->stfmt = -1;
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return r;
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}
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NODE *
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tmp_string(s, len)
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char *s;
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size_t len;
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{
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register NODE *r;
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r = make_string(s, len);
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r->flags |= TEMP;
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return r;
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}
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#define NODECHUNK 100
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NODE *nextfree = NULL;
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NODE *
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more_nodes()
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{
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register NODE *np;
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/* get more nodes and initialize list */
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emalloc(nextfree, NODE *, NODECHUNK * sizeof(NODE), "newnode");
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for (np = nextfree; np < &nextfree[NODECHUNK - 1]; np++) {
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np->flags = 0;
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np->nextp = np + 1;
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}
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np->nextp = NULL;
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np = nextfree;
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nextfree = nextfree->nextp;
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return np;
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}
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#ifdef DEBUG
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void
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freenode(it)
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NODE *it;
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{
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#ifdef MPROF
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it->stref = 0;
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free((char *) it);
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#else /* not MPROF */
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/* add it to head of freelist */
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it->nextp = nextfree;
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nextfree = it;
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#endif /* not MPROF */
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}
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#endif /* DEBUG */
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void
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unref(tmp)
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register NODE *tmp;
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{
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if (tmp == NULL)
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return;
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if (tmp->flags & PERM)
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return;
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if (tmp->flags & (MALLOC|TEMP)) {
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tmp->flags &= ~TEMP;
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if (tmp->flags & STR) {
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if (tmp->stref > 1) {
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if (tmp->stref != 255)
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tmp->stref--;
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return;
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}
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free(tmp->stptr);
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}
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freenode(tmp);
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}
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}
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/*
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* Parse a C escape sequence. STRING_PTR points to a variable containing a
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* pointer to the string to parse. That pointer is updated past the
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* characters we use. The value of the escape sequence is returned.
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*
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* A negative value means the sequence \ newline was seen, which is supposed to
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* be equivalent to nothing at all.
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*
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* If \ is followed by a null character, we return a negative value and leave
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* the string pointer pointing at the null character.
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*
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* If \ is followed by 000, we return 0 and leave the string pointer after the
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* zeros. A value of 0 does not mean end of string.
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*
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* Posix doesn't allow \x.
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*/
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int
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parse_escape(string_ptr)
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char **string_ptr;
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{
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register int c = *(*string_ptr)++;
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register int i;
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register int count;
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switch (c) {
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case 'a':
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return BELL;
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case 'b':
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return '\b';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case 'v':
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return '\v';
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case '\n':
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return -2;
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case 0:
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(*string_ptr)--;
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return -1;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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i = c - '0';
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count = 0;
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while (++count < 3) {
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if ((c = *(*string_ptr)++) >= '0' && c <= '7') {
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i *= 8;
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i += c - '0';
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} else {
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(*string_ptr)--;
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break;
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}
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}
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return i;
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case 'x':
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if (do_lint) {
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static int didwarn;
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if (! didwarn) {
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didwarn = 1;
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warning("Posix does not allow \"\\x\" escapes");
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}
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}
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if (do_posix)
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return ('x');
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if (! isxdigit((*string_ptr)[1])) {
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warning("no hex digits in \\x escape sequence");
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return ('x');
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}
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i = 0;
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while (1) {
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if (isxdigit((c = *(*string_ptr)++))) {
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i *= 16;
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if (isdigit(c))
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i += c - '0';
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else if (isupper(c))
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i += c - 'A' + 10;
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else
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i += c - 'a' + 10;
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} else {
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(*string_ptr)--;
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break;
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}
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}
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return i;
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default:
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return c;
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}
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}
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