1 /* $OpenBSD: b_print.c,v 1.25 2014/06/12 15:49:28 deraadt Exp $ */
3 /* Theo de Raadt places this file in the public domain. */
5 #include <openssl/bio.h>
8 BIO_printf(BIO *bio, const char *format, ...)
13 va_start(args, format);
14 ret = BIO_vprintf(bio, format, args);
21 _BIO_write(void *cookie, const char *buf, int nbytes)
23 return BIO_write(cookie, buf, nbytes);
27 BIO_vprintf(BIO *bio, const char *format, va_list args)
32 fp = funopen(bio, NULL, &_BIO_write, NULL, NULL);
37 ret = vfprintf(fp, format, args);
43 #else /* !HAVE_FUNOPEN */
46 BIO_vprintf(BIO *bio, const char *format, va_list args)
51 ret = vasprintf(&buf, format, args);
56 BIO_write(bio, buf, ret);
62 #endif /* HAVE_FUNOPEN */
65 * BIO_snprintf and BIO_vsnprintf return -1 for overflow,
66 * due to the history of this API. Justification:
68 * Traditional snprintf surfaced in 4.4BSD, and returned
69 * "number of bytes wanted". Solaris and Windows opted to
70 * return -1. A draft standard was written which returned -1.
71 * Due to the large volume of code already using the first
72 * semantics, the draft was repaired before standardization to
73 * specify "number of bytes wanted" plus "-1 for character conversion
74 * style errors". Solaris adapted to this rule, but Windows stuck
77 * Original OpenSSL comment which is full of lies:
79 * "In case of truncation, return -1 like traditional snprintf.
80 * (Current drafts for ISO/IEC 9899 say snprintf should return
81 * the number of characters that would have been written,
82 * had the buffer been large enough.)"
85 BIO_snprintf(char *buf, size_t n, const char *format, ...)
90 va_start(args, format);
91 ret = vsnprintf(buf, n, format, args);
94 if (ret >= n || ret == -1)
100 BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
104 ret = vsnprintf(buf, n, format, args);
106 if (ret >= n || ret == -1)