ref: 75f5fdbb0df902d8d7e16a4489a04d92493eacae
dir: /sys/src/ape/cmd/pax/replace.c/
/* $Source: /u/mark/src/pax/RCS/replace.c,v $
*
* $Revision: 1.2 $
*
* replace.c - regular expression pattern replacement functions
*
* DESCRIPTION
*
* These routines provide for regular expression file name replacement
* as required by pax.
*
* AUTHORS
*
* Mark H. Colburn, NAPS International
*
* Sponsored by The USENIX Association for public distribution.
*
* Copyright (c) 1989 Mark H. Colburn.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice is duplicated in all such
* forms and that any documentation, advertising materials, and other
* materials related to such distribution and use acknowledge that the
* software was developed * by Mark H. Colburn and sponsored by The
* USENIX Association.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Log: replace.c,v $
* Revision 1.2 89/02/12 10:05:59 mark
* 1.2 release fixes
*
* Revision 1.1 88/12/23 18:02:36 mark
* Initial revision
*
*/
#ifndef lint
static char *ident = "$Id: replace.c,v 1.2 89/02/12 10:05:59 mark Exp $";
static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
#endif /* not lint */
/* Headers */
#include "pax.h"
/* add_replstr - add a replacement string to the replacement string list
*
* DESCRIPTION
*
* Add_replstr adds a replacement string to the replacement string
* list which is applied each time a file is about to be processed.
*
* PARAMETERS
*
* char *pattern - A regular expression which is to be parsed
*/
#ifdef __STDC__
void add_replstr(char *pattern)
#else
void add_replstr(pattern)
char *pattern;
#endif
{
char *p;
char sep;
Replstr *rptr;
int len;
if ((len = strlen(pattern)) < 4) {
warn("Replacement string not added",
"Malformed substitution syntax");
return;
}
if ((rptr = (Replstr *) malloc(sizeof(Replstr))) == (Replstr *)NULL) {
warn("Replacement string not added", "No space");
return;
}
/* First character is the delimeter... */
sep = *pattern;
/* Get trailing g and/or p */
p = pattern + len - 1;
while (*p != sep) {
if (*p == 'g') {
rptr->global = 1;
} else if (*p == 'p') {
rptr->print = 1;
} else {
warn(p, "Invalid RE modifier");
}
p--;
}
if (*p != sep) {
warn("Replacement string not added", "Bad delimeters");
free(rptr);
return;
}
/* strip off leading and trailing delimeter */
*p = '\0';
pattern++;
/* find the separating '/' in the pattern */
p = pattern;
while (*p) {
if (*p == sep) {
break;
}
if (*p == '\\' && *(p + 1) != '\0') {
p++;
}
p++;
}
if (*p != sep) {
warn("Replacement string not added", "Bad delimeters");
free(rptr);
return;
}
*p++ = '\0';
/*
* Now pattern points to 'old' and p points to 'new' and both are '\0'
* terminated
*/
if ((rptr->comp = regcomp(pattern)) == (regexp *)NULL) {
warn("Replacement string not added", "Invalid RE");
free(rptr);
return;
}
rptr->replace = p;
rptr->next = (Replstr *)NULL;
if (rplhead == (Replstr *)NULL) {
rplhead = rptr;
rpltail = rptr;
} else {
rpltail->next = rptr;
rpltail = rptr;
}
}
/* rpl_name - possibly replace a name with a regular expression
*
* DESCRIPTION
*
* The string name is searched for in the list of regular expression
* substituions. If the string matches any of the regular expressions
* then the string is modified as specified by the user.
*
* PARAMETERS
*
* char *name - name to search for and possibly modify
*/
#ifdef __STDC__
void rpl_name(char *name)
#else
void rpl_name(name)
char *name;
#endif
{
int found = 0;
int ret;
Replstr *rptr;
char buff[PATH_MAX + 1];
char buff1[PATH_MAX + 1];
char buff2[PATH_MAX + 1];
char *p;
char *b;
strcpy(buff, name);
for (rptr = rplhead; !found && rptr != (Replstr *)NULL; rptr = rptr->next) {
do {
if ((ret = regexec(rptr->comp, buff)) != 0) {
p = buff;
b = buff1;
while (p < rptr->comp->startp[0]) {
*b++ = *p++;
}
p = rptr->replace;
while (*p) {
*b++ = *p++;
}
strcpy(b, rptr->comp->endp[0]);
found = 1;
regsub(rptr->comp, buff1, buff2);
strcpy(buff, buff2);
}
} while (ret && rptr->global);
if (found) {
if (rptr->print) {
fprintf(stderr, "%s >> %s\n", name, buff);
}
strcpy(name, buff);
}
}
}
/* get_disposition - get a file disposition
*
* DESCRIPTION
*
* Get a file disposition from the user. If the user enters 'y'
* the the file is processed, anything else and the file is ignored.
* If the user enters EOF, then the PAX exits with a non-zero return
* status.
*
* PARAMETERS
*
* char *mode - string signifying the action to be taken on file
* char *name - the name of the file
*
* RETURNS
*
* Returns 1 if the file should be processed, 0 if it should not.
*/
#ifdef __STDC__
int get_disposition(char *mode, char *name)
#else
int get_disposition(mode, name)
char *mode;
char *name;
#endif
{
char ans[2];
char buf[PATH_MAX + 10];
if (f_disposition) {
sprintf(buf, "%s %s? ", mode, name);
if (nextask(buf, ans, sizeof(ans)) == -1 || ans[0] == 'q') {
exit(0);
}
if (strlen(ans) == 0 || ans[0] != 'y') {
return(1);
}
}
return(0);
}
/* get_newname - prompt the user for a new filename
*
* DESCRIPTION
*
* The user is prompted with the name of the file which is currently
* being processed. The user may choose to rename the file by
* entering the new file name after the prompt; the user may press
* carriage-return/newline, which will skip the file or the user may
* type an 'EOF' character, which will cause the program to stop.
*
* PARAMETERS
*
* char *name - filename, possibly modified by user
* int size - size of allowable new filename
*
* RETURNS
*
* Returns 0 if successfull, or -1 if an error occurred.
*
*/
#ifdef __STDC__
int get_newname(char *name, int size)
#else
int get_newname(name, size)
char *name;
int size;
#endif
{
char buf[PATH_MAX + 10];
if (f_interactive) {
sprintf(buf, "rename %s? ", name);
if (nextask(buf, name, size) == -1) {
exit(0);
}
if (strlen(name) == 0) {
return(1);
}
}
return(0);
}