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

* lib/posix/setenv.c: Rewrite C-constructs not supported by M2-Planet.
This commit is contained in:
Jan (janneke) Nieuwenhuizen 2020-05-17 19:28:58 +02:00
parent cf7fc8ec2b
commit 2012304dc8
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1 changed files with 18 additions and 9 deletions
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27
lib/posix/setenv.c
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@ -22,25 +22,34 @@
#include <string.h>
#include <stdlib.h>
// CONSTANT M2_PTR_SIZE 4
#define M2_PTR_SIZE 1
int
setenv (char const *s, char const *v, int overwrite_p)
{
char **p = environ;
int length = strlen (s);
while (*p)
while (p[0] != 0)
{
if (!strncmp (s, *p, length) && *(*p + length) == '=')
break;
p++;
if (strncmp (s, p[0], length) == 0)
{
char *q = p[0] + length;
if (q[0] == '=')
break;
}
p = p + M2_PTR_SIZE;
}
char *entry = malloc (length + strlen (v) + 2);
int end_p = *p == 0;
*p = entry;
int end_p = p[0] == 0;
p[0] = entry;
strcpy (entry, s);
strcpy (entry + length, "=");
strcpy (entry + length + 1, v);
*(entry + length + strlen (v) + 2) = 0;
if (end_p)
*++p = 0;
entry[length + strlen (v) + 2] = 0;
if (end_p != 0)
p[1] = 0;
return 0;
}