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ident: replace sbuf(9) with open_memstream(3)

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This change makes ident only dependant on libc functions

This makes our ident(1) more portable, also the fact that we only
depend on libc which is maintained with excellent backward compatibility
means that if one day ident is removed from base, someone using FreeBSD
22 will be able to fetch ident from FreeBSD 14 to run ident against
FreeBSD 1.0 binary

MFC After:	1 week
This commit is contained in:
Baptiste Daroussin 2021-10-28 15:39:24 +02:00
parent 4ee0f6d874
commit 1a4d5f13ba
2 changed files with 23 additions and 14 deletions
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2
usr.bin/ident/Makefile
View file

@ -4,8 +4,6 @@
PROG= ident
LIBADD= sbuf
HAS_TESTS=
SUBDIR.${MK_TESTS}+= tests

35
usr.bin/ident/ident.c
View file

@ -1,5 +1,5 @@
/*-
* Copyright (c) 2015 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2015-2021 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2015 Xin LI <delphij@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <xlocale.h>
@ -58,10 +59,17 @@ scan(FILE *fp, const char *name, bool quiet)
bool hasid = false;
bool subversion = false;
analyzer_states state = INIT;
struct sbuf *id = sbuf_new_auto();
FILE* buffp;
char *buf;
size_t sz;
locale_t l;
l = newlocale(LC_ALL_MASK, "C", NULL);
sz = 0;
buf = NULL;
buffp = open_memstream(&buf, &sz);
if (buffp == NULL)
err(EXIT_FAILURE, "open_memstream()");
if (name != NULL)
printf("%s:\n", name);
@ -80,9 +88,11 @@ scan(FILE *fp, const char *name, bool quiet)
case DELIM_SEEN:
if (isalpha_l(c, l)) {
/* Transit to KEYWORD if we see letter */
sbuf_clear(id);
sbuf_putc(id, '$');
sbuf_putc(id, c);
if (buf != NULL)
memset(buf, 0, sz);
rewind(buffp);
fputc('$', buffp);
fputc(c, buffp);
state = KEYWORD;
continue;
@ -95,7 +105,7 @@ scan(FILE *fp, const char *name, bool quiet)
}
break;
case KEYWORD:
sbuf_putc(id, c);
fputc(c, buffp);
if (isalpha_l(c, l)) {
/*
@ -125,7 +135,7 @@ scan(FILE *fp, const char *name, bool quiet)
break;
case PUNC_SEEN:
case PUNC_SEEN_SVN:
sbuf_putc(id, c);
fputc(c, buffp);
switch (c) {
case ':':
@ -159,13 +169,13 @@ scan(FILE *fp, const char *name, bool quiet)
}
break;
case TEXT:
sbuf_putc(id, c);
fputc(c, buffp);
if (iscntrl_l(c, l)) {
/* Control characters are not allowed in this state */
state = INIT;
} else if (c == '$') {
sbuf_finish(id);
fflush(buffp);
/*
* valid ident should end with a space.
*
@ -175,9 +185,9 @@ scan(FILE *fp, const char *name, bool quiet)
* subversion mode. No length check is enforced
* because GNU RCS ident(1) does not do it either.
*/
c = sbuf_data(id)[sbuf_len(id) - 2];
c = buf[strlen(buf) -2 ];
if (c == ' ' || (subversion && c == '#')) {
printf(" %s\n", sbuf_data(id));
printf(" %s\n", buf);
hasid = true;
}
state = INIT;
@ -186,7 +196,8 @@ scan(FILE *fp, const char *name, bool quiet)
break;
}
}
sbuf_delete(id);
fclose(buffp);
free(buf);
freelocale(l);
if (!hasid) {