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: /opt/proj/minix/cvsroot/src/lib/ack/libm2/Arguments.c,v 1.1 2005/10/10 15:27:46 beng Exp $
*/

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);
}

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