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#if 0
#include <errno.h>
#include <stdio.h>
#include <string.h>
/** print an error message **/
void perror(const char *s)
{
if (s != NULL && *s != '\0') {
fprintf(stderr, "%s: ", s);
}
fprintf(stderr, "%s\n", strerror(errno));
}
/***
writes an error message to IDENTIFIER(stderr).
If ARGUMENT(s) is CONSTANT(NULL), the error message is a string representation of the
current value of IDENTIFIER(errno).
If ARGUMENT(s) is not CONSTANT(NULL), the error message will be preceded by the string
pointed to by ARGUMENT(s), a colon (CHAR(:)), and a space.
***/
/*
POSIX_(L_C_MESSAGES)
STDC(1)
*/
#endif
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