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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/plan9/_envsetup.c – Rev 2

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#include "lib.h"
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include "sys9.h"
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#include "dir.h"
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/*
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 * Called before main to initialize environ.
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 * Some plan9 environment variables
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 * have 0 bytes in them (notably $path);
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 * we change them to 1's (and execve changes back)
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 *
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 * Also, register the note handler.
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 */
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char **environ;
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int errno;
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unsigned long _clock;
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static void fdsetup(char *, char *);
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static void sigsetup(char *, char *);
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enum {
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	Envhunk=7000,
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};
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void
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_envsetup(void)
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{
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	int dfd, fdinited, n, nd, m, i, j, f, nohandle, psize, cnt;
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	char *ps, *p;
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	char **pp;
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	char name[NAME_MAX+5];
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	Dir *d9, *d9a;
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	static char **emptyenvp = 0;
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	environ = emptyenvp;		/* pessimism */
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	nohandle = 0;
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	fdinited = 0;
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	cnt = 0;
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	strcpy(name, "#e");
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	dfd = _OPEN(name, 0);
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	if(dfd < 0)
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		return;
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	name[2] = '/';
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	ps = p = malloc(Envhunk);
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	if(p == 0)
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		return;
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	psize = Envhunk;
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	nd = _dirreadall(dfd, &d9a);
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	_CLOSE(dfd);
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	for(j=0; j<nd; j++){
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		d9 = &d9a[j];
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		n = strlen(d9->name);
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		if(n >= sizeof name - 4)
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			continue;	/* shouldn't be possible */
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		m = d9->length;
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		i = p - ps;
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		if(i+n+1+m+1 > psize) {
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			psize += (n+m+2 < Envhunk)? Envhunk : n+m+2;
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			ps = realloc(ps, psize);
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			if (ps == 0) {
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				free(d9a);
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				return;
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			}
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			p = ps + i;
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		}
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		memcpy(p, d9->name, n);
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		p[n] = '=';
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		strcpy(name+3, d9->name);
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		f = _OPEN(name, O_RDONLY);
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		if(f < 0 || _READ(f, p+n+1, m) != m)
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			m = 0;
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		_CLOSE(f);
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		if(p[n+m] == 0)
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			m--;
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		for(i=0; i<m; i++)
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			if(p[n+1+i] == 0)
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				p[n+1+i] = 1;
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		p[n+1+m] = 0;
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		if(strcmp(d9->name, "_fdinfo") == 0) {
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			_fdinit(p+n+1, p+n+1+m);
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			fdinited = 1;
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		} else if(strcmp(d9->name, "_sighdlr") == 0)
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			sigsetup(p+n+1, p+n+1+m);
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		else if(strcmp(d9->name, "nohandle") == 0)
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			nohandle = 1;
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		p += n+m+2;
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		cnt++;
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	}
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	free(d9a);
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	if(!fdinited)
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		_fdinit(0, 0);
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	pp = malloc((1+cnt)*sizeof(char *));
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	if (pp == 0)
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		return;
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	environ = pp;
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	p = ps;
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	for(i = 0; i < cnt; i++) {
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		*pp++ = p;
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		p = memchr(p, 0, ps+psize-p);
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		if (!p)
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			break;
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		p++;
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	}
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	*pp = 0;
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	if(!nohandle)
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		_NOTIFY(_notehandler);
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}
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static void
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sigsetup(char *s, char *se)
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{
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	int sig;
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	char *e;
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	while(s < se){
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		sig = strtoul(s, &e, 10);
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		if(s == e)
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			break;
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		s = e;
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		if(sig <= MAXSIG)
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			_sighdlr[sig] = SIG_IGN;
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	}
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}