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irix-657m-src/eoe/cmd/fgrep/fgrep.c
2022-09-29 17:59:04 +03:00

418 lines
7.3 KiB
C

/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
#ident "@(#)fgrep:fgrep.c 1.7"
#ident "$Header: /proj/irix6.5.7m/isms/eoe/cmd/fgrep/RCS/fgrep.c,v 1.8 1999/08/23 20:08:16 tee Exp $"
/*
* fgrep -- print all lines containing any of a set of keywords
*
* status returns:
* 0 - ok, and some matches
* 1 - ok, but no matches
* 2 - some error
*/
#include <stdio.h>
#include <stdlib.h>
/* The same() macro and letter() function were inserted to allow for the -i option */
#define same(a,b) (a == b || iflag && (a ^ b) == ' ' && letter(a) == letter(b))
#define BLKSIZE 512
#define MAXSIZ 16381
#define QSIZE 4093
struct words {
char inp;
char out;
struct words *nst;
struct words *link;
struct words *fail;
} w[MAXSIZ], *smax, *q;
FILE *fptr;
long lnum;
#ifdef sgi
int bflag, cflag, lflag, fflag, nflag, sflag, vflag, xflag, eflag;
#else
int bflag, cflag, lflag, fflag, nflag, vflag, xflag, eflag;
#endif
int iflag;
int retcode = 0;
int nfile;
long blkno;
int nsucc;
long tln;
FILE *wordf;
char *argptr;
extern char *optarg;
extern int optind;
void execute(char *file);
void cfail(void);
void overflo(void);
void cgotofn(void);
int getargc(void);
int letter(int);
main(argc, argv)
char **argv;
{
register c;
char *usage;
int errflg = 0;
usage = "[ -bcilnvx ] [ -e exp ] [ -f file ] [ strings ] [ file ] ...";
while(( c = getopt(argc, argv, "bcie:f:lnsvx")) != EOF)
switch(c) {
case 'b':
bflag++;
continue;
case 'i':
iflag++;
continue;
case 'c':
cflag++;
continue;
case 'e':
eflag++;
argptr = optarg;
continue;
case 'f':
fflag++;
wordf = fopen(optarg, "r");
if (wordf==NULL) {
fprintf(stderr, "fgrep: can't open %s\n", optarg);
exit(2);
}
continue;
case 'l':
lflag++;
continue;
case 'n':
nflag++;
continue;
#ifdef sgi
case 's':
sflag++;
continue;
#endif
case 'v':
vflag++;
continue;
case 'x':
xflag++;
continue;
case '?':
errflg++;
}
argc -= optind;
if (errflg || ((argc <= 0) && !fflag && !eflag)) {
printf("usage: fgrep %s\n",usage);
exit(2);
}
if ( !eflag && !fflag ) {
argptr = argv[optind];
optind++;
argc--;
}
cgotofn();
cfail();
nfile = argc;
argv = &argv[optind];
if (argc<=0) {
if (lflag && (argc < 0)) exit(1);
execute((char *)NULL);
}
else
while ( --argc >= 0 ) {
execute(*argv);
argv++;
}
return(retcode != 0 ? retcode : nsucc == 0);
}
void
execute(char *file)
{
register char *p;
register struct words *c;
register ccount;
char buf[2*BUFSIZ];
int failed;
char *nlp;
char *stdinp;
if (file) {
if ((fptr = fopen(file, "r")) == NULL) {
#ifdef sgi
if (!sflag)
#endif
fprintf(stderr, "fgrep: can't open %s\n", file);
retcode = 2;
return;
}
}
else {
fptr = stdin;
stdinp = "(standard input)";
}
ccount = 0;
failed = 0;
lnum = 1;
tln = 0;
blkno = 0;
p = buf;
nlp = p;
c = w;
for (;;) {
if (--ccount <= 0) {
if (p == &buf[2*BUFSIZ]) p = buf;
if (p > &buf[BUFSIZ]) {
if ((ccount = fread(p, sizeof(char), &buf[2*BUFSIZ] - p, fptr)) <= 0) break;
}
else if ((ccount = fread(p, sizeof(char), BUFSIZ, fptr)) <= 0) break;
blkno += (long)ccount;
}
nstate:
if (same(c->inp,*p)) {
c = c->nst;
}
else if (c->link != 0) {
c = c->link;
goto nstate;
}
else {
c = c->fail;
failed = 1;
if (c==0) {
c = w;
istate:
if (same(c->inp,*p)) {
c = c->nst;
}
else if (c->link != 0) {
c = c->link;
goto istate;
}
}
else goto nstate;
}
if (c->out) {
while (*p++ != '\n') {
if (--ccount <= 0) {
if (p == &buf[2*BUFSIZ]) p = buf;
if (p > &buf[BUFSIZ]) {
if ((ccount = fread(p, sizeof(char), &buf[2*BUFSIZ] - p, fptr)) <= 0) break;
}
else if ((ccount = fread(p, sizeof(char), BUFSIZ, fptr)) <= 0) break;
blkno += (long)ccount;
}
}
if ( (vflag && (failed == 0 || xflag == 0)) || (vflag == 0 && xflag && failed) )
goto nomatch;
succeed: nsucc = 1;
if (cflag) tln++;
#ifdef sgi
else if (sflag)
/* be silent */;
#endif
else if (lflag) {
printf("%s\n", (file?file:stdinp));
fclose(fptr);
return;
}
else {
if (nfile > 1) printf("%s:", file);
if (bflag) printf("%d:", (blkno-(long)(ccount-1))/BLKSIZE);
if (nflag) printf("%ld:", lnum);
if (p <= nlp) {
while (nlp < &buf[2*BUFSIZ]) putchar(*nlp++);
nlp = buf;
}
while (nlp < p) putchar(*nlp++);
}
nomatch: lnum++;
nlp = p;
c = w;
failed = 0;
continue;
}
if (*p++ == '\n')
if (vflag) goto succeed;
else {
lnum++;
nlp = p;
c = w;
failed = 0;
}
}
fclose(fptr);
if (cflag) {
if (nfile > 1)
printf("%s:", file);
printf("%ld\n", tln);
}
}
getargc(void)
{
/* appends a newline to shell quoted argument list so */
/* the list looks like it came from an ed style file */
register c;
static int endflg;
if (wordf)
return(getc(wordf));
if (endflg)
return(EOF);
if ((c = *argptr++) == '\0') {
endflg++;
return('\n');
}
return(c);
}
void
cgotofn(void)
{
register c;
register struct words *s;
s = smax = w;
nword: for(;;) {
c = getargc();
if (c==EOF)
return;
if (c == '\n') {
if (xflag) {
for(;;) {
if (s->inp == c) {
s = s->nst;
break;
}
if (s->inp == 0) goto nenter;
if (s->link == 0) {
if (smax >= &w[MAXSIZ -1]) overflo();
s->link = ++smax;
s = smax;
goto nenter;
}
s = s->link;
}
}
s->out = 1;
s = w;
} else {
loop: if (same(s->inp, c)) {
s = s->nst;
continue;
}
if (s->inp == 0) goto enter;
if (s->link == 0) {
if (smax >= &w[MAXSIZ - 1]) overflo();
s->link = ++smax;
s = smax;
goto enter;
}
s = s->link;
goto loop;
}
}
enter:
do {
s->inp = c;
if (smax >= &w[MAXSIZ - 1]) overflo();
s->nst = ++smax;
s = smax;
} while ((c = getargc()) != '\n' && c!=EOF);
if (xflag) {
nenter: s->inp = '\n';
if (smax >= &w[MAXSIZ -1]) overflo();
s->nst = ++smax;
}
smax->out = 1;
s = w;
if (c != EOF)
goto nword;
}
void
overflo(void)
{
fprintf(stderr, "wordlist too large\n");
exit(2);
}
void
cfail(void)
{
struct words *queue[QSIZE];
struct words **front, **rear;
struct words *state;
register char c;
register struct words *s;
s = w;
front = rear = queue;
init: if ((s->inp) != 0) {
*rear++ = s->nst;
if (rear >= &queue[QSIZE - 1]) overflo();
}
if ((s = s->link) != 0) {
goto init;
}
while (rear!=front) {
s = *front;
if (front == &queue[QSIZE-1])
front = queue;
else front++;
cloop: if ((c = s->inp) != 0) {
*rear = (q = s->nst);
if (front < rear)
if (rear >= &queue[QSIZE-1])
if (front == queue) overflo();
else rear = queue;
else rear++;
else
if (++rear == front) overflo();
state = s->fail;
floop: if (state == 0) state = w;
if (state->inp == c) {
qloop: q->fail = state->nst;
if ((state->nst)->out == 1) q->out = 1;
if ((q = q->link) != 0) goto qloop;
}
else if ((state = state->link) != 0)
goto floop;
}
if ((s = s->link) != 0)
goto cloop;
}
}
letter(int c)
{
if (c >= 'a' && c <= 'z')
return (c);
if (c >= 'A' && c <= 'z')
return (c + 'a' - 'A');
return(0);
}