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| Current File : //usr/src/contrib/tcsh/ma.setp.c |
/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/*
* setpath --- smart interface for setting path variables
*
* usage: setpath(paths, cmds, localsyspath, dosuffix, printerrors)
* char **paths, **cmds, *localsyspath;
* int dosuffix, printerrors;
*
* The 'paths' argument is a list of pointers to path lists of the
* form "name=value" where name is the name of the path and value
* is a colon separated list of directories. There can never be
* more than MAXDIRS (64) directories in a path.
*
* The 'cmds' argument may be a sequence of any of the following:
* -r reset path to default
* -i newpath insert newpath before localsyspath
* -ia oldpath newpath insert newpath after oldpath
* -ib oldpath newpath insert newpath before oldpath
* -i# newpath insert newpath at position #
* -d oldpath delete oldpath
* -d# delete path at position #
* -c oldpath newpath change oldpath to newpath
* -c# newpath change position # to newpath
*
* The "-i newpath" command is equivilent to "-ib 'localsyspath' newpath".
*
* If 'dosuffix' is true, the appropriate suffix will be added to
* all command operands for any system path in 'paths'.
*
* Both of the 'paths' and 'cmds' lists are terminated by a NULL
* entry.
*
* if 'printerrors' is true, setpath will printf error diagnostics.
*
* WARNING !!!: Under no circumstances should anyone change this
* module without fully understanding the impact on the C shell.
* The C shell has it's own malloc and printf routines and this
* module was carefully written taking that into account. Do not
* use any stdio routines from this module except printf.
*
**********************************************************************
* HISTORY
*
* Revision 1.4 90/12/11 17:58:44 mja
* Add copyright/disclaimer for distribution.
*
* 05-Jun-88 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Make all non-entry points static.
*
* 30-Apr-88 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Added -r switch to reset paths to their default values.
*
* 06-Jan-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Created from old setpath program for the shell.
*
**********************************************************************
*/
#include "sh.h"
RCSID("$tcsh: ma.setp.c,v 1.19 2007/11/20 20:03:51 christos Exp $")
#ifdef MACH
#define MAXDIRS 64 /* max directories on a path */
#ifndef NULL
# define NULL 0
#endif
static int npaths; /* # pathlist arguments */
static struct pelem {
struct pelem *pnext; /* pointer to next path */
char *pname; /* name of pathlist */
char *psuf; /* suffix for pathlist */
char *pdef; /* default for pathlist */
int pdirs; /* # directories on each pathlist */
char *pdir[MAXDIRS]; /* directory names for each pathlist */
} *pathhead = NULL;
static struct {
char *name;
char *suffix;
char *defalt;
} syspath[] = {
"PATH", "/bin", ":/usr/ucb:/bin:/usr/bin",
"CPATH", "/include", ":/usr/include",
"LPATH", "/lib", ":/lib:/usr/lib",
"MPATH", "/man", ":/usr/man",
"EPATH", "/maclib", "",
0, 0, 0
};
static int sflag;
static int eflag;
#define INVALID { \
if (eflag) xprintf(CGETS(10, 1, \
"setpath: invalid command '%s'.\n"), cmd); \
freepaths(); \
return(-1); \
}
#define TOOFEW { \
if (eflag) xprintf(CGETS(10, 2, \
"setpath: insufficient arguments to command '%s'.\n"), cmd); \
freepaths(); \
return(-1); \
}
static int initpaths (char **);
static void savepaths (char **);
static void freepaths (void);
static void tcsh_rcmd (char *);
static void icmd (char *, char *);
static void iacmd (char *, char *);
static void ibcmd (char *, char *);
static void incmd (char *, int);
static void insert (struct pelem *, int, char *);
static void dcmd (char *);
static void dncmd (int);
static void delete (struct pelem *, int);
static void ccmd (char *, char *);
static void cncmd (char *, int);
static void change (struct pelem *, int, char *);
static int locate (struct pelem *, char *);
int
setpath(char **paths, char **cmds, char *localsyspath, int dosuffix,
int printerrors)
{
char *cmd, *cmd1, *cmd2;
int ncmd;
sflag = dosuffix;
eflag = printerrors;
if (initpaths(paths) < 0)
return(-1);
if (npaths == 0)
return(0);
for (ncmd = 0; cmd = cmds[ncmd]; ncmd++) {
if (cmd[0] != '-')
INVALID;
cmd1 = cmds[ncmd+1];
cmd2 = cmds[ncmd+2];
switch (cmd[1]) {
case 'r':
if (cmd[2] != '\0')
INVALID;
tcsh_rcmd(localsyspath);
break;
case 'i':
if (cmd[2] == '\0') {
ncmd++;
if (cmd1 == NULL) TOOFEW;
icmd(cmd1, localsyspath);
} else if (isdigit(cmd[2])) {
ncmd++;
if (cmd1 == NULL) TOOFEW;
incmd(cmd1, atoi(cmd+2));
} else if (cmd[3] != '\0' || (cmd[2] != 'a' && cmd[2] != 'b')) {
INVALID;
} else {
ncmd += 2;
if (cmd1 == NULL || cmd2 == NULL) TOOFEW;
if (cmd[2] == 'a')
iacmd(cmd1, cmd2);
else
ibcmd(cmd1, cmd2);
}
break;
case 'd':
if (cmd[2] == '\0') {
ncmd++;
if (cmd1 == NULL) TOOFEW;
dcmd(cmd1);
} else if (isdigit(cmd[2]))
dncmd(atoi(cmd+2));
else {
INVALID;
}
break;
case 'c':
if (cmd[2] == '\0') {
ncmd += 2;
if (cmd1 == NULL || cmd2 == NULL) TOOFEW;
ccmd(cmd1, cmd2);
} else if (isdigit(cmd[2])) {
ncmd++;
if (cmd1 == NULL) TOOFEW;
cncmd(cmd1, atoi(cmd+2));
} else {
INVALID;
}
break;
default:
INVALID;
}
}
savepaths(paths);
freepaths();
return(0);
}
static int
initpaths(char **paths)
{
char *path, *val, *p, *q;
int i, done;
struct pelem *pe, *pathend;
freepaths();
for (npaths = 0; path = paths[npaths]; npaths++) {
val = index(path, '=');
if (val == NULL) {
if (eflag)
xprintf(CGETS(10, 3,
"setpath: value missing in path '%s'\n"), path);
freepaths();
return(-1);
}
*val++ = '\0';
pe = xmalloc(sizeof(struct pelem));
setzero(pe, sizeof(struct pelem));
if (pathhead == NULL)
pathhead = pathend = pe;
else {
pathend->pnext = pe;
pathend = pe;
}
p = strsave(path);
pe->pname = p;
pe->psuf = "";
pe->pdef = "";
for (i = 0; syspath[i].name; i++)
if (strcmp(pe->pname, syspath[i].name) == 0) {
pe->psuf = syspath[i].suffix;
pe->pdef = syspath[i].defalt;
break;
}
q = val;
for (;;) {
q = index(p = q, ':');
done = (q == NULL);
if (!done)
*q++ = '\0';
p = strsave(p);
pe->pdir[pe->pdirs] = p;
pe->pdirs++;
if (done)
break;
}
}
return(0);
}
static void
savepaths(char **paths)
{
char *p, *q;
int npath, i, len;
struct pelem *pe;
for (npath = 0, pe = pathhead; pe; npath++, pe = pe->pnext) {
len = strlen(pe->pname) + 1;
if (pe->pdirs == 0)
len++;
else for (i = 0; i < pe->pdirs; i++)
len += strlen(pe->pdir[i]) + 1;
p = xmalloc((unsigned)len);
paths[npath] = p;
for (q = pe->pname; *p = *q; p++, q++);
*p++ = '=';
if (pe->pdirs != 0) {
for (i = 0; i < pe->pdirs; i++) {
for (q = pe->pdir[i]; *p = *q; p++, q++);
*p++ = ':';
}
p--;
}
*p = '\0';
}
}
static void
freepaths(void)
{
char *p;
int i;
struct pelem *pe;
if (npaths == 0 || pathhead == NULL)
return;
while (pe = pathhead) {
if (pe->pname) {
for (i = 0; i < pe->pdirs; i++) {
if (pe->pdir[i] == NULL)
continue;
p = pe->pdir[i];
pe->pdir[i] = NULL;
xfree((ptr_t) p);
}
pe->pdirs = 0;
p = pe->pname;
pe->pname = NULL;
xfree((ptr_t) p);
}
pathhead = pe->pnext;
xfree((ptr_t) pe);
}
npaths = 0;
}
/***********************************************
*** R E S E T A P A T H N A M E ***
***********************************************/
static void
tcsh_rcmd(char *localsyspath) /* reset path with localsyspath */
{
int n, done;
char *new, *p;
struct pelem *pe;
char newbuf[MAXPATHLEN+1];/*FIXBUF*/
for (pe = pathhead; pe; pe = pe->pnext) {
new = newbuf;
*new = '\0';
if (localsyspath != NULL) {
*new = ':';
(void) strcpy(new + 1, localsyspath);
(void) strcat(new, pe->psuf);
}
(void) strcat(new, pe->pdef);
for (n = 0; n < pe->pdirs; n++) {
if (pe->pdir[n] == NULL)
continue;
p = pe->pdir[n];
pe->pdir[n] = NULL;
xfree((ptr_t) p);
}
pe->pdirs = 0;
for (;;) {
new = index(p = new, ':');
done = (new == NULL);
if (!done)
*new++ = '\0';
p = strsave(p);
pe->pdir[pe->pdirs] = p;
pe->pdirs++;
if (done)
break;
}
}
}
/***********************************************
*** I N S E R T A P A T H N A M E ***
***********************************************/
static void
icmd(char *path, char *localsyspath) /* insert path before localsyspath */
{
int n;
char *new;
struct pelem *pe;
char newbuf[MAXPATHLEN+1];/*FIXBUF*/
for (pe = pathhead; pe; pe = pe->pnext) {
if (sflag)
new = localsyspath;
else {
new = newbuf;
(void) strcpy(new, localsyspath);
(void) strcat(new, pe->psuf);
}
n = locate(pe, new);
if (n >= 0)
insert(pe, n, path);
else
insert(pe, 0, path);
}
}
static void
iacmd(char *inpath, char *path) /* insert path after inpath */
{
int n;
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
n = locate(pe, inpath);
if (n >= 0)
insert(pe, n + 1, path);
else
xprintf(CGETS(10, 4, "setpath: %s not found in %s\n"),
inpath, pe->pname);
}
}
static void
ibcmd(char *inpath, char *path) /* insert path before inpath */
{
int n;
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
n = locate(pe, inpath);
if (n >= 0)
insert(pe, n, path);
else
xprintf(CGETS(10, 4, "setpath: %s not found in %s\n"),
inpath, pe->pname);
}
}
static void
incmd(char *path, int n) /* insert path at position n */
{
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext)
insert(pe, n, path);
}
static void
insert(struct pelem *pe, int loc, char *key)
{
int i;
char *new;
char newbuf[2000];/*FIXBUF*/
if (sflag) { /* add suffix */
new = newbuf;
(void) strcpy(new, key);
(void) strcat(new, pe->psuf);
} else
new = key;
new = strsave(new);
for (i = pe->pdirs; i > loc; --i)
pe->pdir[i] = pe->pdir[i-1];
if (loc > pe->pdirs)
loc = pe->pdirs;
pe->pdir[loc] = new;
pe->pdirs++;
}
/***********************************************
*** D E L E T E A P A T H N A M E ***
***********************************************/
static void
dcmd(char *path) /* delete path */
{
int n;
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
n = locate(pe, path);
if (n >= 0)
delete(pe, n);
else
xprintf(CGETS(10, 4, "setpath: %s not found in %s\n"),
path, pe->pname);
}
}
static void
dncmd(int n) /* delete at position n */
{
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
if (n < pe->pdirs)
delete(pe, n);
else
xprintf(CGETS(10, 5,
"setpath: %d not valid position in %s\n"),
n, pe->pname);
}
}
static void
delete(struct pelem *pe, int n)
{
int d;
xfree((ptr_t) (pe->pdir[n]));
for (d = n; d < pe->pdirs - 1; d++)
pe->pdir[d] = pe->pdir[d+1];
--pe->pdirs;
}
/***********************************************
*** C H A N G E A P A T H N A M E ***
***********************************************/
static void
ccmd(char *inpath, char *path) /* change inpath to path */
{
int n;
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
n = locate(pe, inpath);
if (n >= 0)
change(pe, n, path);
else
xprintf(CGETS(10, 4, "setpath: %s not found in %s\n"),
inpath, pe->pname);
}
}
static void
cncmd(char *path, int n) /* change at position n to path */
{
struct pelem *pe;
for (pe = pathhead; pe; pe = pe->pnext) {
if (n < pe->pdirs)
change(pe, n, path);
else
xprintf(CGETS(10, 5,
"setpath: %d not valid position in %s\n"),
n, pe->pname);
}
}
static void
change(struct pelem *pe, int loc, char *key)
{
char *new;
char newbuf[MAXPATHLEN+1];/*FIXBUF*/
if (sflag) { /* append suffix */
new = newbuf;
(void) strcpy(new, key);
(void) strcat(new, pe->psuf);
} else
new = key;
new = strsave(new);
xfree((ptr_t) (pe->pdir[loc]));
pe->pdir[loc] = new;
}
/***************************************
*** F I N D P A T H N A M E ***
***************************************/
static int
locate(struct pelem *pe, char *key)
{
int i;
char *realkey;
char keybuf[MAXPATHLEN+1];/*FIXBUF*/
if (sflag) {
realkey = keybuf;
(void) strcpy(realkey, key);
(void) strcat(realkey, pe->psuf);
} else
realkey = key;
for (i = 0; i < pe->pdirs; i++)
if (strcmp(pe->pdir[i], realkey) == 0)
break;
return((i < pe->pdirs) ? i : -1);
}
#endif