minix/lib/ack/libm2/Arguments.c

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/*
(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/*
Module: Access to program arguments and environment
Author: Ceriel J.H. Jacobs
Version: $Header$
*/
extern char **argv, ***_penviron;
extern int argc;
unsigned int _Arguments__Argc;
static char *
findname(s1, s2)
register char *s1, *s2;
{
while (*s1 == *s2++) s1++;
if (*s1 == '\0' && *(s2-1) == '=') return s2;
return 0;
}
static unsigned int
scopy(src, dst, max)
register char *src, *dst;
unsigned int max;
{
register unsigned int i = 0;
while (*src && i <= max) {
i++;
*dst++ = *src++;
}
if (i <= max) {
*dst = '\0';
return i+1;
}
while (*src++) i++;
return i + 1;
}
_Arguments_()
{
_Arguments__Argc = argc;
}
unsigned
_Arguments__Argv(n, argument, l, u, s)
unsigned int u;
char *argument;
{
if (n >= argc) return 0;
return scopy(argv[n], argument, u);
}
unsigned
_Arguments__GetEnv(name, nn, nu, ns, value, l, u, s)
char *name, *value;
unsigned int nu, u;
{
register char **p = *_penviron;
register char *v = 0;
while (*p && !(v = findname(name, *p++))) {
/* nothing */
}
if (!v) return 0;
return scopy(v, value, u);
}