/* $NetBSD: qsubst.c,v 1.8 2004/11/01 21:36:11 dsl Exp $ */
/*
* qsubst -- designed for renaming routines existing in a whole bunch
* of files. Needs -ltermcap.
*
* Usage:
*
* qsubst str1 str2 [ options ]
*
* qsubst reads its options (see below) to get a list of files. For
* each file on this list, it then replaces str1 with str2 wherever
* possible in that file, depending on user input (see below). The
* result is written back onto the original file.
*
* For each possible substitution, the user is prompted with a few
* lines before and after the line containing the string to be
* substituted. The string itself is displayed using the terminal's
* standout mode, if any. Then one character is read from the
* terminal. This is then interpreted as follows (this is designed to
* be like Emacs' query-replace-string):
*
* space replace this occurrence and go on to the next one
* . replace this occurrence and don't change any more in
* this file (ie, go on to the next file).
* , tentatively replace this occurrence. The lines as they
* would look if the substitution were made are printed
* out. Then another character is read and it is used to
* decide the result (possibly undoing the tentative
* replacement).
* n don't change this one, but go on to the next one
* ^G don't change this one or any others in this file, but
* instead go on to the next file.
* ! change the rest in this file without asking, then go on
* to the next file (at which point qsubst will start
* asking again).
* ? print out the current filename and ask again.
*
* The first two arguments to qsubst are always the string to replace
* and the string to replace it with. The options are as follows:
*
* -w The search string is considered as a C symbol; it must
* be bounded by non-symbol characters. This option
* toggles. (`w' for `word'.)
* -! Enter ! mode automatically at the beginning of each
* file.
* -go Same as -!
* -noask Same as -!
* -nogo Negate -go
* -ask Negate -noask (same as -nogo)
* -cN (N is a number) Give N lines of context above and below
* the line with the match when prompting the user.
* -CAN (N is a number) Give N lines of context above the line
* with the match when prompting the user.
* -CBN (N is a number) Give N lines of context below the line
* with the match when prompting the user.
* -f filename
* The filename following the -f argument is one of the
* files qsubst should perform substitutions in.
* -F filename
* qsubst should read the named file to get the names of
* files to perform substitutions in. The names should
* appear one to a line.
*
* The default amount of context is -c2, that is, two lines above and
* two lines below the line with the match.
*
* Arguments not beginning with a - sign in the options field are
* implicitly preceded by -f. Thus, -f is really needed only when the
* file name begins with a - sign.
*
* qsubst reads its options in order and processes files as it gets
* them. This means, for example, that a -go will affect only files
* from -f or -F options appearing after the -go option.
*
* The most context you can get is ten lines each, above and below
* (corresponding to -c10).
*
* Str1 is limited to 512 characters; there is no limit on the size of
* str2. Neither one may contain a NUL.
*
* NULs in the file may cause qsubst to make various mistakes.
*
* If any other program modifies the file while qsubst is running, all
* bets are off.
*
* This program is in the public domain. Anyone may use it in any way
* for any purpose. Of course, it's also up to you to determine
* whether what it does is suitable for you; the above comments may
* help, but I can't promise they're accurate. It's free, and you get
* what you pay for.
*
* If you find any bugs I would appreciate hearing about them,
* especially if you also fix them.
*
* der Mouse
*
* mouse@rodents.montreal.qc.ca
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: qsubst.c,v 1.8 2004/11/01 21:36:11 dsl Exp $");
#endif
#include <sys/file.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <termcap.h>
#include <termios.h>
#include <unistd.h>
extern const char *__progname;
#define MAX_C_A 10
#define MAX_C_B 10
#define BUF_SIZ 1024
static int debugging;
static FILE *tempf;
static long tbeg;
static FILE *workf;
static char *str1;
static char *str2;
static int s1l;
static int s2l;
static long nls[MAX_C_A + 1];
static char buf[(BUF_SIZ * 2) + 2];
static char *bufp;
static char *bufp0;
static char *bufpmax;
static int rahead;
static int cabove;
static int cbelow;
static int wordmode;
static int flying;
static int flystate;
static int allfly;
static const char *nullstr = "";
static int ul_;
static char *current_file;
static const char *beginul;
static const char *endul;
static char tcp_buf[1024];
static char cap_buf[1024];
static struct termios orig_tio;
static void
tstp_self(void)
{
void (*old_tstp) (int);
int mask;
mask = sigblock(0);
kill(getpid(), SIGTSTP);
old_tstp = signal(SIGTSTP, SIG_DFL);
sigsetmask(mask & ~sigmask(SIGTSTP));
signal(SIGTSTP, old_tstp);
}
/* ARGSUSED */
static void
sigtstp(int sig)
{
struct termios tio;
if (tcgetattr(0, &tio) < 0) {
tstp_self();
return;
}
tcsetattr(0, TCSAFLUSH | TCSASOFT, &orig_tio);
tstp_self();
tcsetattr(0, TCSADRAIN | TCSASOFT, &tio);
}
static void
limit_above_below(void)
{
if (cabove > MAX_C_A) {
cabove = MAX_C_A;
}
if (cbelow > MAX_C_B) {
cbelow = MAX_C_B;
}
}
static int
issymchar(unsigned char c)
{
return (isascii(c) && (isalnum(c) || (c == '_') || (c == '$')));
}
static int
foundit(void)
{
if (wordmode) {
return (!issymchar(bufp[-1]) &&
!issymchar(bufp[-2 - s1l]) &&
!bcmp(bufp - 1 - s1l, str1, s1l));
} else {
return (!bcmp(bufp - s1l, str1, s1l));
}
}
static int
putcharf(int c)
{
return (putchar(c));
}
static void
put_ul(char *s)
{
if (ul_) {
for (; *s; s++) {
printf("_\b%c", *s);
}
} else {
tputs(beginul, 1, putcharf);
fputs(s, stdout);
tputs(endul, 1, putcharf);
}
}
static int
getc_cbreak(void)
{
struct termios tio;
struct termios otio;
char c;
if (tcgetattr(0, &tio) < 0)
return (getchar());
otio = tio;
tio.c_lflag &= ~(ICANON | ECHOKE | ECHOE | ECHO | ECHONL);
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
tcsetattr(0, TCSANOW | TCSASOFT, &tio);
switch (read(0, &c, 1)) {
case -1:
break;
case 0:
break;
case 1:
break;
}
tcsetattr(0, TCSANOW | TCSASOFT, &otio);
return (c);
}
static int
doit(void)
{
long save;
int i;
int lastnl;
int use_replacement;
if (flying) {
return (flystate);
}
use_replacement = 0;
save = ftell(workf);
do {
for (i = MAX_C_A - cabove; nls[i] < 0; i++);
fseek(workf, nls[i], 0);
for (i = save - nls[i] - rahead; i; i--) {
putchar(getc(workf));
}
put_ul(use_replacement ? str2 : str1);
fseek(workf, save + s1l - rahead, 0);
lastnl = 0;
i = cbelow + 1;
while (i > 0) {
int c;
c = getc(workf);
if (c == EOF) {
clearerr(workf);
break;
}
putchar(c);
lastnl = 0;
if (c == '\n') {
i--;
lastnl = 1;
}
}
if (!lastnl)
printf("\n[no final newline] ");
fseek(workf, save, 0);
i = -1;
while (i == -1) {
switch (getc_cbreak()) {
case ' ':
i = 1;
break;
case '.':
i = 1;
flying = 1;
flystate = 0;
break;
case 'n':
i = 0;
break;
case '\7':
i = 0;
flying = 1;
flystate = 0;
break;
case '!':
i = 1;
flying = 1;
flystate = 1;
break;
case ',':
use_replacement = !use_replacement;
i = -2;
printf("(using %s string gives)\n",
use_replacement ? "new" : "old");
break;
case '?':
printf("File is `%s'\n", current_file);
break;
default:
putchar('\7');
break;
}
}
} while (i < 0);
if (i) {
printf("(replacing");
} else {
printf("(leaving");
}
if (flying) {
if (flystate == i) {
printf(" this and all the rest");
} else if (flystate) {
printf(" this, replacing all the rest");
} else {
printf(" this, leaving all the rest");
}
}
printf(")\n");
return (i);
}
static void
add_shift(long *a, long e, int n)
{
int i;
n--;
for (i = 0; i < n; i++) {
a[i] = a[i + 1];
}
a[n] = e;
}
static void
process_file(char *fn)
{
int i;
long n;
int c;
workf = fopen(fn, "r+");
if (workf == NULL) {
fprintf(stderr, "%s: cannot read %s\n", __progname, fn);
return;
}
printf("(file: %s)\n", fn);
current_file = fn;
for (i = 0; i <= MAX_C_A; i++) {
nls[i] = -1;
}
nls[MAX_C_A] = 0;
tbeg = -1;
if (wordmode) {
bufp0 = &buf[1];
rahead = s1l + 1;
buf[0] = '\0';
} else {
bufp0 = &buf[0];
rahead = s1l;
}
if (debugging) {
printf("[rahead = %d, bufp0-buf = %ld]\n",
rahead, (long) (bufp0 - &buf[0]));
}
n = 0;
bufp = bufp0;
bufpmax = &buf[sizeof(buf) - s1l - 2];
flying = allfly;
flystate = 1;
while (1) {
c = getc(workf);
if (c == EOF) {
if (tbeg >= 0) {
if (bufp > bufp0)
fwrite(bufp0, 1, bufp - bufp0, tempf);
fseek(workf, tbeg, 0);
n = ftell(tempf);
fseek(tempf, 0L, 0);
for (; n; n--) {
putc(getc(tempf), workf);
}
fflush(workf);
ftruncate(fileno(workf), ftell(workf));
}
fclose(workf);
return;
}
*bufp++ = c;
n++;
if (debugging) {
printf("[got %c, n now %ld, bufp-buf %ld]\n",
c, n, (long) (bufp - bufp0));
}
if ((n >= rahead) && foundit() && doit()) {
int wbehind;
if (debugging) {
printf("[doing change]\n");
}
wbehind = 1;
if (tbeg < 0) {
tbeg = ftell(workf) - rahead;
fseek(tempf, 0L, 0);
if (debugging) {
printf("[tbeg set to %d]\n",
(int)tbeg);
}
wbehind = 0;
}
if (bufp[-1] == '\n')
add_shift(nls, ftell(workf), MAX_C_A + 1);
if ((n > rahead) && wbehind) {
fwrite(bufp0, 1, n - rahead, tempf);
if (debugging) {
printf("[writing %ld from bufp0]\n",
n - rahead);
}
}
fwrite(str2, 1, s2l, tempf);
n = rahead - s1l;
if (debugging) {
printf("[n now %ld]\n", n);
}
if (n > 0) {
bcopy(bufp - n, bufp0, n);
if (debugging) {
printf("[copying %ld back]\n", n);
}
}
bufp = bufp0 + n;
} else {
if (bufp[-1] == '\n')
add_shift(nls, ftell(workf), MAX_C_A + 1);
if (bufp >= bufpmax) {
if (tbeg >= 0) {
fwrite(bufp0, 1, n - rahead, tempf);
if (debugging) {
printf("[flushing %ld]\n",
n - rahead);
}
}
n = rahead;
bcopy(bufp - n, bufp0, n);
if (debugging) {
printf("[n now %ld]\n[copying %ld back]\n", n, n);
}
bufp = bufp0 + n;
}
}
}
}
static void
process_indir_file(char *fn)
{
char newfn[1024];
FILE *f;
f = fopen(fn, "r");
if (f == NULL) {
fprintf(stderr, "%s: cannot read %s\n", __progname, fn);
return;
}
while (fgets(newfn, sizeof(newfn), f) == newfn) {
newfn[strlen(newfn) - 1] = '\0';
process_file(newfn);
}
fclose(f);
}
int
main(int ac, char **av)
{
int skip;
char *cp;
if (ac < 3) {
fprintf(stderr, "usage: %s str1 str2 [ -w -! -noask -go -f file -F file ]\n",
__progname);
exit(1);
}
cp = getenv("TERM");
if (cp == 0) {
beginul = nullstr;
endul = nullstr;
} else {
if (tgetent(tcp_buf, cp) != 1) {
beginul = nullstr;
endul = nullstr;
} else {
cp = cap_buf;
if (tgetflag("os") || tgetflag("ul")) {
ul_ = 1;
} else {
ul_ = 0;
beginul = tgetstr("us", &cp);
if (beginul == 0) {
beginul = tgetstr("so", &cp);
if (beginul == 0) {
beginul = nullstr;
endul = nullstr;
} else {
endul = tgetstr("se", &cp);
}
} else {
endul = tgetstr("ue", &cp);
}
}
}
}
{
static char tmp[] = "/tmp/qsubst.XXXXXX";
int fd;
fd = mkstemp(&tmp[0]);
if (fd < 0) {
fprintf(stderr, "%s: cannot create temp file: %s\n",
__progname, strerror(errno));
exit(1);
}
tempf = fdopen(fd, "w+");
}
if ((access(av[1], R_OK | W_OK) == 0) &&
(access(av[ac - 1], R_OK | W_OK) < 0) &&
(access(av[ac - 2], R_OK | W_OK) < 0)) {
fprintf(stderr, "%s: argument order has changed, it's now: str1 str2 files...\n", __progname);
}
str1 = av[1];
str2 = av[2];
av += 2;
ac -= 2;
s1l = strlen(str1);
s2l = strlen(str2);
if (s1l > BUF_SIZ) {
fprintf(stderr, "%s: search string too long (max %d chars)\n",
__progname, BUF_SIZ);
exit(1);
}
tcgetattr(0, &orig_tio);
signal(SIGTSTP, sigtstp);
allfly = 0;
cabove = 2;
cbelow = 2;
skip = 0;
for (ac--, av++; ac; ac--, av++) {
if (skip > 0) {
skip--;
continue;
}
if (**av == '-') {
++*av;
if (!strcmp(*av, "debug")) {
debugging++;
} else if (!strcmp(*av, "w")) {
wordmode = !wordmode;
} else if ((strcmp(*av, "!") == 0) ||
(strcmp(*av, "go") == 0) ||
(strcmp(*av, "noask") == 0)) {
allfly = 1;
} else if ((strcmp(*av, "nogo") == 0) ||
(strcmp(*av, "ask") == 0)) {
allfly = 0;
} else if (**av == 'c') {
cabove = atoi(++*av);
cbelow = cabove;
limit_above_below();
} else if (**av == 'C') {
++*av;
if (**av == 'A') {
cabove = atoi(++*av);
limit_above_below();
} else if (**av == 'B') {
cbelow = atoi(++*av);
limit_above_below();
} else {
fprintf(stderr, "%s: -C must be -CA or -CB\n", __progname);
}
} else if ((strcmp(*av, "f") == 0) ||
(strcmp(*av, "F") == 0)) {
if (++skip >= ac) {
fprintf(stderr, "%s: -%s what?\n",
__progname, *av);
} else {
if (**av == 'f') {
process_file(av[skip]);
} else {
process_indir_file(av[skip]);
}
}
}
} else {
process_file(*av);
}
}
exit(0);
}