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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* xargs/tw command arg list support
*/
#include <ast.h>
#include <ctype.h>
#include <error.h>
#include <proc.h>
#include "cmdarg.h"
#ifndef ARG_MAX
#define ARG_MAX (64*1024)
#endif
#ifndef EXIT_QUIT
#define EXIT_QUIT 255
#endif
static const char* echo[] = { "echo", 0 };
/*
* open a cmdarg stream
* initialize the command for execution
* argv[-1] is reserved for procrun(PROC_ARGMOD)
*/
Cmdarg_t*
cmdopen(char** argv, int argmax, int size, const char* argpat, int flags)
{
register Cmdarg_t* cmd;
register int n;
register char** p;
register char* s;
char* sh;
int c;
int m;
int argc;
long x;
char** post = 0;
n = sizeof(char**);
if (*argv)
{
for (p = argv + 1; *p; p++)
{
if ((flags & CMD_POST) && argpat && streq(*p, argpat))
{
*p = 0;
post = p + 1;
argpat = 0;
}
else
n += strlen(*p) + 1;
}
argc = p - argv;
}
else
argc = 0;
for (p = environ; *p; p++)
n += sizeof(char**) + strlen(*p) + 1;
if ((x = strtol(astconf("ARG_MAX", NiL, NiL), NiL, 0)) <= 0)
x = ARG_MAX;
if (size <= 0 || size > x)
size = x;
sh = pathshell();
m = n + (argc + 4) * sizeof(char**) + strlen(sh) + 1;
m = roundof(m, sizeof(char**));
if (size < m)
{
error(2, "size must be at least %d", m);
return 0;
}
if ((m = x / 10) > 2048)
m = 2048;
if (size > (x - m))
size = x - m;
n = size - n;
m = ((flags & CMD_INSERT) && argpat) ? (strlen(argpat) + 1) : 0;
if (!(cmd = newof(0, Cmdarg_t, 1, n + m)))
{
error(ERROR_SYSTEM|2, "out of space");
return 0;
}
c = n / sizeof(char**);
if (argmax <= 0 || argmax > c)
argmax = c;
s = cmd->buf;
if (!argv[0])
{
argv = (char**)echo;
cmd->echo = 1;
}
else if (streq(argv[0], echo[0]))
{
cmd->echo = 1;
flags &= ~CMD_NEWLINE;
}
else if (!(flags & CMD_CHECKED))
{
if (!pathpath(s, argv[0], NiL, PATH_REGULAR|PATH_EXECUTE))
{
if (!(flags & CMD_SILENT))
{
error(ERROR_SYSTEM|2, "%s: command not found", argv[0]);
exit(EXIT_NOTFOUND);
}
free(cmd);
return 0;
}
argv[0] = s;
}
s += strlen(s) + 1;
if (m)
{
cmd->insert = strcpy(s, argpat);
cmd->insertlen = m - 1;
s += m;
}
s += sizeof(char**) - (s - cmd->buf) % sizeof(char**);
p = (char**)s;
n -= strlen(*p++ = sh) + 1;
cmd->argv = p;
while (*p = *argv++)
p++;
if (m)
{
argmax = 1;
*p++ = 0;
cmd->insertarg = p;
argv = cmd->argv;
c = *cmd->insert;
while (s = *argv)
{
while ((s = strchr(s, c)) && strncmp(cmd->insert, s, cmd->insertlen))
s++;
*p++ = s ? *argv : (char*)0;
argv++;
}
*p++ = 0;
}
cmd->firstarg = cmd->nextarg = p;
cmd->laststr = cmd->nextstr = cmd->buf + n;
cmd->argmax = argmax;
cmd->flags = flags;
cmd->offset = ((cmd->postarg = post) ? (argc - (post - argv)) : 0) + 3;
return cmd;
}
/*
* flush outstanding command file args
*/
int
cmdflush(register Cmdarg_t* cmd)
{
register char* s;
register char** p;
register int n;
if (cmd->flags & CMD_EMPTY)
cmd->flags &= ~CMD_EMPTY;
else if (cmd->nextarg <= cmd->firstarg)
return 0;
if ((cmd->flags & CMD_MINIMUM) && cmd->argcount < cmd->argmax)
{
if (!(cmd->flags & CMD_SILENT))
error(2, "%d arg command would be too long", cmd->argcount);
return -1;
}
cmd->total.args += cmd->argcount;
cmd->total.commands++;
cmd->argcount = 0;
if (p = cmd->postarg)
while (*cmd->nextarg++ = *p++);
else
*cmd->nextarg = 0;
if (s = cmd->insert)
{
char* a;
char* b;
char* e;
char* t;
char* u;
int c;
int m;
a = cmd->firstarg[0];
b = (char*)&cmd->nextarg[1];
e = cmd->nextstr;
c = *s;
m = cmd->insertlen;
for (n = 1; cmd->argv[n]; n++)
if (t = cmd->insertarg[n])
{
cmd->argv[n] = b;
for (;;)
{
if (!(u = strchr(t, c)))
{
b += sfsprintf(b, e - b, "%s", t);
break;
}
if (!strncmp(s, u, m))
{
b += sfsprintf(b, e - b, "%-.*s%s", u - t, t, a);
t = u + m;
}
else if (b >= e)
break;
else
{
*b++ = *u++;
t = u;
}
}
if (b < e)
*b++ = 0;
}
if (b >= e)
{
if (!(cmd->flags & CMD_SILENT))
error(2, "%s: command too large after insert", a);
return -1;
}
}
cmd->nextarg = cmd->firstarg;
cmd->nextstr = cmd->laststr;
if (cmd->flags & (CMD_QUERY|CMD_TRACE))
{
p = cmd->argv;
sfprintf(sfstderr, "+ %s", *p);
while (s = *++p)
sfprintf(sfstderr, " %s", s);
if (!(cmd->flags & CMD_QUERY))
sfprintf(sfstderr, "\n");
else if (astquery(1, "? "))
return 0;
}
if (cmd->echo)
{
n = (cmd->flags & CMD_NEWLINE) ? '\n' : ' ';
for (p = cmd->argv + 1; s = *p++;)
sfputr(sfstdout, s, *p ? n : '\n');
n = 0;
}
else if ((n = procrun(*cmd->argv, cmd->argv, PROC_ARGMOD|PROC_IGNOREPATH)) == -1)
{
if (!(cmd->flags & CMD_SILENT))
{
error(ERROR_SYSTEM|2, "%s: command exec error", *cmd->argv);
exit(EXIT_NOTFOUND - 1);
}
return -1;
}
else if (n >= EXIT_NOTFOUND - 1)
{
if (!(cmd->flags & CMD_SILENT))
exit(n);
}
else if (!(cmd->flags & CMD_IGNORE))
{
if (n == EXIT_QUIT && !(cmd->flags & CMD_SILENT))
exit(2);
if (n)
error_info.errors++;
}
return n;
}
/*
* add file to the command arg list
*/
int
cmdarg(register Cmdarg_t* cmd, const char* file, register int len)
{
int i;
int r;
r = 0;
if (len)
{
while ((cmd->nextstr -= len + 1) < (char*)(cmd->nextarg + cmd->offset))
{
if (cmd->nextarg == cmd->firstarg)
{
error(2, "%s: path too long for exec args", file);
return -1;
}
if (i = cmdflush(cmd))
{
if (r < i)
r = i;
if (!(cmd->flags & CMD_IGNORE))
return r;
}
}
*cmd->nextarg++ = cmd->nextstr;
memcpy(cmd->nextstr, file, len);
cmd->nextstr[len] = 0;
cmd->argcount++;
if (cmd->argcount >= cmd->argmax && (i = cmdflush(cmd)) > r)
r = i;
}
return r;
}
/*
* close a cmdarg stream
*/
int
cmdclose(Cmdarg_t* cmd)
{
int n;
if ((cmd->flags & CMD_EXACT) && cmd->argcount < cmd->argmax)
{
if (!(cmd->flags & CMD_SILENT))
error(2, "only %d arguments for last command", cmd->argcount);
return -1;
}
cmd->flags &= ~CMD_MINIMUM;
n = cmdflush(cmd);
free(cmd);
return n;
}
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