Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>

char*
getenv(char *name)
{
        int r, f;
        long s;
        char *ans;
        char *p, *ep, ename[100];

        if(strchr(name, '/') != nil)
                return nil;
        snprint(ename, sizeof ename, "/env/%s", name);
        if(strcmp(ename+5, name) != 0)
                return nil;
        f = open(ename, OREAD);
        if(f < 0)
                return 0;
        s = seek(f, 0, 2);
        ans = malloc(s+1);
        if(ans) {
                setmalloctag(ans, getcallerpc(&name));
                seek(f, 0, 0);
                r = read(f, ans, s);
                if(r >= 0) {
                        ep = ans + s - 1;
                        for(p = ans; p < ep; p++)
                                if(*p == '\0')
                                        *p = ' ';
                        ans[s] = '\0';
                }
        }
        close(f);
        return ans;
}