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https://github.com/fluencelabs/musl
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649af9f73a
thanks to mikachu per POSIX: The setenv() function shall fail if: [EINVAL] The name argument is a null pointer, points to an empty string, or points to a string containing an '=' character.
32 lines
521 B
C
32 lines
521 B
C
#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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int __putenv(char *s, int a);
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int setenv(const char *var, const char *value, int overwrite)
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{
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char *s;
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int l1, l2;
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if (!var || !*var || strchr(var, '=')) {
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errno = EINVAL;
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return -1;
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}
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if (!overwrite && getenv(var)) return 0;
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l1 = strlen(var);
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l2 = strlen(value);
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s = malloc(l1+l2+2);
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memcpy(s, var, l1);
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s[l1] = '=';
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memcpy(s+l1+1, value, l2);
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s[l1+l2+1] = 0;
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if (__putenv(s, 1)) {
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free(s);
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errno = ENOMEM;
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return -1;
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}
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return 0;
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}
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