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initial import
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garbeam@wmii.de
197
awk/main.c
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197
awk/main.c
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/****************************************************************
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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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char *version = "version 19990602";
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#define DEBUG
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include "awk.h"
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#include "y.tab.h"
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extern char **environ;
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extern int nfields;
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int dbg = 0;
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char *cmdname; /* gets argv[0] for error messages */
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extern FILE *yyin; /* lex input file */
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char *lexprog; /* points to program argument if it exists */
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extern int errorflag; /* non-zero if any syntax errors; set by yyerror */
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int compile_time = 2; /* for error printing: */
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/* 2 = cmdline, 1 = compile, 0 = running */
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char *pfile[20]; /* program filenames from -f's */
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int npfile = 0; /* number of filenames */
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int curpfile = 0; /* current filename */
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int safe = 0; /* 1 => "safe" mode */
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int main(int argc, char *argv[])
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{
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char *fs = NULL, *marg;
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int temp;
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cmdname = argv[0];
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if (argc == 1) {
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fprintf(stderr, "Usage: %s [-f programfile | 'program'] [-Ffieldsep] [-v var=value] [files]\n", cmdname);
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exit(1);
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}
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signal(SIGFPE, fpecatch);
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yyin = NULL;
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symtab = makesymtab(NSYMTAB);
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while (argc > 1 && argv[1][0] == '-' && argv[1][1] != '\0') {
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if (strcmp(argv[1], "--") == 0) { /* explicit end of args */
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argc--;
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argv++;
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break;
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}
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switch (argv[1][1]) {
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case 's':
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if (strcmp(argv[1], "-safe") == 0)
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safe = 1;
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break;
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case 'f': /* next argument is program filename */
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argc--;
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argv++;
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if (argc <= 1)
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FATAL("no program filename");
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pfile[npfile++] = argv[1];
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break;
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case 'F': /* set field separator */
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if (argv[1][2] != 0) { /* arg is -Fsomething */
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if (argv[1][2] == 't' && argv[1][3] == 0) /* wart: t=>\t */
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fs = "\t";
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else if (argv[1][2] != 0)
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fs = &argv[1][2];
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} else { /* arg is -F something */
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argc--; argv++;
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if (argc > 1 && argv[1][0] == 't' && argv[1][1] == 0) /* wart: t=>\t */
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fs = "\t";
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else if (argc > 1 && argv[1][0] != 0)
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fs = &argv[1][0];
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}
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if (fs == NULL || *fs == '\0')
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WARNING("field separator FS is empty");
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break;
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case 'v': /* -v a=1 to be done NOW. one -v for each */
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if (argv[1][2] == '\0' && --argc > 1 && isclvar((++argv)[1]))
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setclvar(argv[1]);
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break;
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case 'm': /* more memory: -mr=record, -mf=fields */
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/* no longer needed */
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marg = argv[1];
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if (argv[1][3])
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temp = atoi(&argv[1][3]);
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else {
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argv++; argc--;
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temp = atoi(&argv[1][0]);
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}
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switch (marg[2]) {
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case 'r': recsize = temp; break;
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case 'f': nfields = temp; break;
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default: FATAL("unknown option %s\n", marg);
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}
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break;
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case 'd':
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dbg = atoi(&argv[1][2]);
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if (dbg == 0)
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dbg = 1;
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printf("awk %s\n", version);
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break;
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case 'V': /* added for exptools "standard" */
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printf("awk %s\n", version);
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exit(0);
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break;
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default:
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WARNING("unknown option %s ignored", argv[1]);
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break;
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}
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argc--;
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argv++;
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}
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/* argv[1] is now the first argument */
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if (npfile == 0) { /* no -f; first argument is program */
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if (argc <= 1) {
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if (dbg)
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exit(0);
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FATAL("no program given");
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}
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dprintf( ("program = |%s|\n", argv[1]) );
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lexprog = argv[1];
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argc--;
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argv++;
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}
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recinit(recsize);
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syminit();
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compile_time = 1;
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argv[0] = cmdname; /* put prog name at front of arglist */
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dprintf( ("argc=%d, argv[0]=%s\n", argc, argv[0]) );
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arginit(argc, argv);
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if (!safe)
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envinit(environ);
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yyparse();
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if (fs)
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*FS = qstring(fs, '\0');
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dprintf( ("errorflag=%d\n", errorflag) );
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if (errorflag == 0) {
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compile_time = 0;
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run(winner);
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} else
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bracecheck();
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return(errorflag);
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}
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int pgetc(void) /* get 1 character from awk program */
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{
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int c;
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for (;;) {
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if (yyin == NULL) {
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if (curpfile >= npfile)
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return EOF;
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if (strcmp(pfile[curpfile], "-") == 0)
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yyin = stdin;
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else if ((yyin = fopen(pfile[curpfile], "r")) == NULL)
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FATAL("can't open file %s", pfile[curpfile]);
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lineno = 1;
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}
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if ((c = getc(yyin)) != EOF)
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return c;
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if (yyin != stdin)
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fclose(yyin);
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yyin = NULL;
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curpfile++;
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}
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}
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char *cursource(void) /* current source file name */
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{
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if (npfile > 0)
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return pfile[curpfile];
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else
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return NULL;
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}
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