460 lines
12 KiB
C
460 lines
12 KiB
C
/****************************************************************
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Copyright (C) Lucent Technologies 1997
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name Lucent Technologies or any of
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its entities not be used in advertising or publicity pertaining
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to distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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#define DEBUG
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#include <stdio.h>
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#include <math.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include "awk.h"
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#include "ytab.h"
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#define FULLTAB 2 /* rehash when table gets this x full */
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#define GROWTAB 4 /* grow table by this factor */
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Array *symtab; /* main symbol table */
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char **FS; /* initial field sep */
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char **RS; /* initial record sep */
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char **OFS; /* output field sep */
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char **ORS; /* output record sep */
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char **OFMT; /* output format for numbers */
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char **CONVFMT; /* format for conversions in getsval */
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Awkfloat *NF; /* number of fields in current record */
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Awkfloat *NR; /* number of current record */
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Awkfloat *FNR; /* number of current record in current file */
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char **FILENAME; /* current filename argument */
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Awkfloat *ARGC; /* number of arguments from command line */
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char **SUBSEP; /* subscript separator for a[i,j,k]; default \034 */
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Awkfloat *RSTART; /* start of re matched with ~; origin 1 (!) */
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Awkfloat *RLENGTH; /* length of same */
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Cell *fsloc; /* FS */
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Cell *nrloc; /* NR */
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Cell *nfloc; /* NF */
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Cell *fnrloc; /* FNR */
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Array *ARGVtab; /* symbol table containing ARGV[...] */
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Array *ENVtab; /* symbol table containing ENVIRON[...] */
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Cell *rstartloc; /* RSTART */
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Cell *rlengthloc; /* RLENGTH */
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Cell *symtabloc; /* SYMTAB */
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Cell *nullloc; /* a guaranteed empty cell */
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Node *nullnode; /* zero&null, converted into a node for comparisons */
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Cell *literal0;
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extern Cell **fldtab;
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void syminit(void) /* initialize symbol table with builtin vars */
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{
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literal0 = setsymtab("0", "0", 0.0, NUM|STR|CON|DONTFREE, symtab);
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/* this is used for if(x)... tests: */
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nullloc = setsymtab("$zero&null", "", 0.0, NUM|STR|CON|DONTFREE, symtab);
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nullnode = celltonode(nullloc, CCON);
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fsloc = setsymtab("FS", " ", 0.0, STR|DONTFREE, symtab);
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FS = &fsloc->sval;
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RS = &setsymtab("RS", "\n", 0.0, STR|DONTFREE, symtab)->sval;
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OFS = &setsymtab("OFS", " ", 0.0, STR|DONTFREE, symtab)->sval;
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ORS = &setsymtab("ORS", "\n", 0.0, STR|DONTFREE, symtab)->sval;
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OFMT = &setsymtab("OFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval;
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CONVFMT = &setsymtab("CONVFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval;
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FILENAME = &setsymtab("FILENAME", "", 0.0, STR|DONTFREE, symtab)->sval;
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nfloc = setsymtab("NF", "", 0.0, NUM, symtab);
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NF = &nfloc->fval;
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nrloc = setsymtab("NR", "", 0.0, NUM, symtab);
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NR = &nrloc->fval;
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fnrloc = setsymtab("FNR", "", 0.0, NUM, symtab);
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FNR = &fnrloc->fval;
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SUBSEP = &setsymtab("SUBSEP", "\034", 0.0, STR|DONTFREE, symtab)->sval;
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rstartloc = setsymtab("RSTART", "", 0.0, NUM, symtab);
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RSTART = &rstartloc->fval;
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rlengthloc = setsymtab("RLENGTH", "", 0.0, NUM, symtab);
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RLENGTH = &rlengthloc->fval;
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symtabloc = setsymtab("SYMTAB", "", 0.0, ARR, symtab);
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symtabloc->sval = (char *) symtab;
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}
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void arginit(int ac, char **av) /* set up ARGV and ARGC */
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{
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Cell *cp;
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int i;
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char temp[50];
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ARGC = &setsymtab("ARGC", "", (Awkfloat) ac, NUM, symtab)->fval;
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cp = setsymtab("ARGV", "", 0.0, ARR, symtab);
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ARGVtab = makesymtab(NSYMTAB); /* could be (int) ARGC as well */
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cp->sval = (char *) ARGVtab;
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for (i = 0; i < ac; i++) {
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sprintf(temp, "%d", i);
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if (is_number(*av))
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setsymtab(temp, *av, atof(*av), STR|NUM, ARGVtab);
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else
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setsymtab(temp, *av, 0.0, STR, ARGVtab);
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av++;
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}
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}
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void envinit(char **envp) /* set up ENVIRON variable */
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{
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Cell *cp;
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char *p;
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cp = setsymtab("ENVIRON", "", 0.0, ARR, symtab);
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ENVtab = makesymtab(NSYMTAB);
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cp->sval = (char *) ENVtab;
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for ( ; *envp; envp++) {
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if ((p = strchr(*envp, '=')) == NULL)
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continue;
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if( p == *envp ) /* no left hand side name in env string */
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continue;
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*p++ = 0; /* split into two strings at = */
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if (is_number(p))
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setsymtab(*envp, p, atof(p), STR|NUM, ENVtab);
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else
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setsymtab(*envp, p, 0.0, STR, ENVtab);
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p[-1] = '='; /* restore in case env is passed down to a shell */
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}
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}
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Array *makesymtab(int n) /* make a new symbol table */
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{
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Array *ap;
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Cell **tp;
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ap = (Array *) malloc(sizeof(Array));
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tp = (Cell **) calloc(n, sizeof(Cell *));
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if (ap == NULL || tp == NULL)
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FATAL("out of space in makesymtab");
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ap->nelem = 0;
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ap->size = n;
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ap->tab = tp;
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return(ap);
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}
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void freesymtab(Cell *ap) /* free a symbol table */
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{
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Cell *cp, *temp;
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Array *tp;
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int i;
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if (!isarr(ap))
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return;
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tp = (Array *) ap->sval;
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if (tp == NULL)
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return;
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for (i = 0; i < tp->size; i++) {
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for (cp = tp->tab[i]; cp != NULL; cp = temp) {
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xfree(cp->nval);
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if (freeable(cp))
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xfree(cp->sval);
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temp = cp->cnext; /* avoids freeing then using */
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free(cp);
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tp->nelem--;
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}
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tp->tab[i] = 0;
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}
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if (tp->nelem != 0)
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WARNING("can't happen: inconsistent element count freeing %s", ap->nval);
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free(tp->tab);
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free(tp);
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}
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void freeelem(Cell *ap, const char *s) /* free elem s from ap (i.e., ap["s"] */
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{
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Array *tp;
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Cell *p, *prev = NULL;
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int h;
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tp = (Array *) ap->sval;
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h = hash(s, tp->size);
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for (p = tp->tab[h]; p != NULL; prev = p, p = p->cnext)
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if (strcmp(s, p->nval) == 0) {
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if (prev == NULL) /* 1st one */
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tp->tab[h] = p->cnext;
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else /* middle somewhere */
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prev->cnext = p->cnext;
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if (freeable(p))
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xfree(p->sval);
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free(p->nval);
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free(p);
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tp->nelem--;
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return;
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}
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}
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Cell *setsymtab(const char *n, const char *s, Awkfloat f, unsigned t, Array *tp)
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{
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int h;
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Cell *p;
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if (n != NULL && (p = lookup(n, tp)) != NULL) {
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dprintf( ("setsymtab found %p: n=%s s=\"%s\" f=%g t=%o\n",
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(void*)p, NN(p->nval), NN(p->sval), p->fval, p->tval) );
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return(p);
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}
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p = (Cell *) malloc(sizeof(Cell));
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if (p == NULL)
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FATAL("out of space for symbol table at %s", n);
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p->nval = tostring(n);
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p->sval = s ? tostring(s) : tostring("");
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p->fval = f;
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p->tval = t;
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p->csub = CUNK;
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p->ctype = OCELL;
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tp->nelem++;
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if (tp->nelem > FULLTAB * tp->size)
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rehash(tp);
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h = hash(n, tp->size);
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p->cnext = tp->tab[h];
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tp->tab[h] = p;
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dprintf( ("setsymtab set %p: n=%s s=\"%s\" f=%g t=%o\n",
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(void*)p, p->nval, p->sval, p->fval, p->tval) );
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return(p);
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}
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int hash(const char *s, int n) /* form hash value for string s */
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{
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unsigned hashval;
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for (hashval = 0; *s != '\0'; s++)
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hashval = (*s + 31 * hashval);
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return hashval % n;
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}
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void rehash(Array *tp) /* rehash items in small table into big one */
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{
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int i, nh, nsz;
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Cell *cp, *op, **np;
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nsz = GROWTAB * tp->size;
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np = (Cell **) calloc(nsz, sizeof(Cell *));
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if (np == NULL) /* can't do it, but can keep running. */
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return; /* someone else will run out later. */
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for (i = 0; i < tp->size; i++) {
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for (cp = tp->tab[i]; cp; cp = op) {
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op = cp->cnext;
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nh = hash(cp->nval, nsz);
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cp->cnext = np[nh];
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np[nh] = cp;
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}
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}
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free(tp->tab);
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tp->tab = np;
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tp->size = nsz;
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}
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Cell *lookup(const char *s, Array *tp) /* look for s in tp */
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{
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Cell *p;
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int h;
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h = hash(s, tp->size);
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for (p = tp->tab[h]; p != NULL; p = p->cnext)
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if (strcmp(s, p->nval) == 0)
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return(p); /* found it */
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return(NULL); /* not found */
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}
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Awkfloat setfval(Cell *vp, Awkfloat f) /* set float val of a Cell */
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{
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int fldno;
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if ((vp->tval & (NUM | STR)) == 0)
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funnyvar(vp, "assign to");
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if (isfld(vp)) {
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donerec = 0; /* mark $0 invalid */
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fldno = atoi(vp->nval);
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if (fldno > *NF)
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newfld(fldno);
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dprintf( ("setting field %d to %g\n", fldno, f) );
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} else if (isrec(vp)) {
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donefld = 0; /* mark $1... invalid */
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donerec = 1;
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}
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if (freeable(vp))
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xfree(vp->sval); /* free any previous string */
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vp->tval &= ~STR; /* mark string invalid */
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vp->tval |= NUM; /* mark number ok */
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if (f == -0) /* who would have thought this possible? */
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f = 0;
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dprintf( ("setfval %p: %s = %g, t=%o\n", (void*)vp, NN(vp->nval), f, vp->tval) );
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return vp->fval = f;
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}
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void funnyvar(Cell *vp, const char *rw)
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{
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if (isarr(vp))
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FATAL("can't %s %s; it's an array name.", rw, vp->nval);
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if (vp->tval & FCN)
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FATAL("can't %s %s; it's a function.", rw, vp->nval);
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WARNING("funny variable %p: n=%s s=\"%s\" f=%g t=%o",
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vp, vp->nval, vp->sval, vp->fval, vp->tval);
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}
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char *setsval(Cell *vp, const char *s) /* set string val of a Cell */
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{
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char *t;
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int fldno;
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dprintf( ("starting setsval %p: %s = \"%s\", t=%o, r,f=%d,%d\n",
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(void*)vp, NN(vp->nval), s, vp->tval, donerec, donefld) );
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if ((vp->tval & (NUM | STR)) == 0)
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funnyvar(vp, "assign to");
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if (isfld(vp)) {
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donerec = 0; /* mark $0 invalid */
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fldno = atoi(vp->nval);
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if (fldno > *NF)
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newfld(fldno);
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dprintf( ("setting field %d to %s (%p)\n", fldno, s, s) );
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} else if (isrec(vp)) {
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donefld = 0; /* mark $1... invalid */
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donerec = 1;
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}
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t = tostring(s); /* in case it's self-assign */
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if (freeable(vp))
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xfree(vp->sval);
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vp->tval &= ~NUM;
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vp->tval |= STR;
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vp->tval &= ~DONTFREE;
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dprintf( ("setsval %p: %s = \"%s (%p) \", t=%o r,f=%d,%d\n",
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(void*)vp, NN(vp->nval), t,t, vp->tval, donerec, donefld) );
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return(vp->sval = t);
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}
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Awkfloat getfval(Cell *vp) /* get float val of a Cell */
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{
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if ((vp->tval & (NUM | STR)) == 0)
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funnyvar(vp, "read value of");
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if (isfld(vp) && donefld == 0)
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fldbld();
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else if (isrec(vp) && donerec == 0)
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recbld();
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if (!isnum(vp)) { /* not a number */
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vp->fval = atof(vp->sval); /* best guess */
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if (is_number(vp->sval) && !(vp->tval&CON))
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vp->tval |= NUM; /* make NUM only sparingly */
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}
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dprintf( ("getfval %p: %s = %g, t=%o\n",
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(void*)vp, NN(vp->nval), vp->fval, vp->tval) );
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return(vp->fval);
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}
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static char *get_str_val(Cell *vp, char **fmt) /* get string val of a Cell */
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{
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char s[100]; /* BUG: unchecked */
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double dtemp;
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if ((vp->tval & (NUM | STR)) == 0)
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funnyvar(vp, "read value of");
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if (isfld(vp) && donefld == 0)
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fldbld();
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else if (isrec(vp) && donerec == 0)
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recbld();
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if (isstr(vp) == 0) {
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if (freeable(vp))
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xfree(vp->sval);
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if (modf(vp->fval, &dtemp) == 0) /* it's integral */
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sprintf(s, "%.30g", vp->fval);
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else
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sprintf(s, *fmt, vp->fval);
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vp->sval = tostring(s);
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vp->tval &= ~DONTFREE;
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vp->tval |= STR;
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}
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dprintf( ("getsval %p: %s = \"%s (%p)\", t=%o\n",
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(void*)vp, NN(vp->nval), vp->sval, vp->sval, vp->tval) );
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return(vp->sval);
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}
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char *getsval(Cell *vp) /* get string val of a Cell */
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{
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return get_str_val(vp, CONVFMT);
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}
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char *getpssval(Cell *vp) /* get string val of a Cell for print */
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{
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return get_str_val(vp, OFMT);
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}
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char *tostring(const char *s) /* make a copy of string s */
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{
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char *p;
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p = (char *) malloc(strlen(s)+1);
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if (p == NULL)
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FATAL("out of space in tostring on %s", s);
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strcpy(p, s);
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return(p);
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}
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char *qstring(const char *is, int delim) /* collect string up to next delim */
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{
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const char *os = is;
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int c, n;
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uschar *s = (uschar *) is;
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uschar *buf, *bp;
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if ((buf = (uschar *) malloc(strlen(is)+3)) == NULL)
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FATAL( "out of space in qstring(%s)", s);
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for (bp = buf; (c = *s) != delim; s++) {
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if (c == '\n')
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SYNTAX( "newline in string %.20s...", os );
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else if (c != '\\')
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*bp++ = c;
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else { /* \something */
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c = *++s;
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if (c == 0) { /* \ at end */
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*bp++ = '\\';
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break; /* for loop */
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}
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switch (c) {
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case '\\': *bp++ = '\\'; break;
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case 'n': *bp++ = '\n'; break;
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case 't': *bp++ = '\t'; break;
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case 'b': *bp++ = '\b'; break;
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case 'f': *bp++ = '\f'; break;
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case 'r': *bp++ = '\r'; break;
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default:
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if (!isdigit(c)) {
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*bp++ = c;
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break;
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}
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n = c - '0';
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if (isdigit(s[1])) {
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n = 8 * n + *++s - '0';
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if (isdigit(s[1]))
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n = 8 * n + *++s - '0';
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}
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*bp++ = n;
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break;
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}
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}
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}
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*bp++ = 0;
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return (char *) buf;
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}
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