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#ifndef _CAREFUULPUTC_H
#define _CAREFUULPUTC_H
/* putc() for use in write and wall (that sometimes are sgid tty) */
/* Avoid control characters in our locale, and also ASCII control characters.
Note that the locale of the recipient is unknown. */
#include <stdio.h>
#include <ctype.h>
#define iso8859x_iscntrl(c) \
(((c) & 0x7f) < 0x20 || (c) == 0x7f)
static inline int carefulputc(int c, FILE *fp) {
int ret;
if (c == '\007' || c == '\t' || c == '\r' || c == '\n' ||
(!iso8859x_iscntrl(c) && (isprint(c) || isspace(c))))
ret = putc(c, fp);
else if ((c & 0x80) || !isprint(c^0x40))
ret = fprintf(fp, "\\%3o", (unsigned char) c);
else {
ret = putc('^', fp);
if (ret != EOF)
ret = putc(c^0x40, fp);
}
return (ret < 0) ? EOF : 0;
}
#endif /* _CAREFUULPUTC_H */
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