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mescc: Mes C Library: Prepare for M2-Planet: getenv.

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* lib/posix/getenv.c: Rewrite C-constructs not supported by M2-Planet.
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Jan (janneke) Nieuwenhuizen 2020-05-17 19:28:51 +02:00
parent d49ea35044
commit cf7fc8ec2b
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 19 additions and 5 deletions
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24
lib/posix/getenv.c
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@ -1,4 +1,4 @@
/* -*-comment-start: "//";comment-end:""-*-
/*
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
@ -22,16 +22,30 @@
#include <string.h>
#include <stdlib.h>
// CONSTANT M2_PTR_SIZE 4
#define M2_PTR_SIZE 1
char *
getenv (char const *s)
{
/* eputs ("\ngetenv s="); eputs (s); eputs ("\n"); */
char **p = environ;
int length = strlen (s);
while (*p)
while (p[0] != 0)
{
if (!strncmp (s, *p, length) && *(*p + length) == '=')
return (*p + length + 1);
p++;
/* eputs ("getenv p[0]="); eputs (p[0]); eputs ("\n"); */
if (strncmp (s, p[0], length) == 0)
{
/* eputs ("found!\n"); */
char *q = p[0] + length;
if (q[0] == '=')
return q + 1;
}
/* else */
/* eputs ("not found!\n"); */
p = p + M2_PTR_SIZE;
}
return 0;
}