107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
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/* $OpenBSD: b_print.c,v 1.26 2019/06/28 05:47:57 deraadt Exp $ */
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/* Theo de Raadt places this file in the public domain. */
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#include <openssl/bio.h>
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int
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BIO_printf(BIO *bio, const char *format, ...)
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{
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va_list args;
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int ret;
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va_start(args, format);
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ret = BIO_vprintf(bio, format, args);
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va_end(args);
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return (ret);
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}
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#ifdef HAVE_FUNOPEN
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static int
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_BIO_write(void *cookie, const char *buf, int nbytes)
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{
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return BIO_write(cookie, buf, nbytes);
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}
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int
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BIO_vprintf(BIO *bio, const char *format, va_list args)
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{
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int ret;
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FILE *fp;
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fp = funopen(bio, NULL, &_BIO_write, NULL, NULL);
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if (fp == NULL) {
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ret = -1;
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goto fail;
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}
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ret = vfprintf(fp, format, args);
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fclose(fp);
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fail:
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return (ret);
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}
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#else /* !HAVE_FUNOPEN */
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int
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BIO_vprintf(BIO *bio, const char *format, va_list args)
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{
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int ret;
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char *buf = NULL;
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ret = vasprintf(&buf, format, args);
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if (ret == -1)
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return (ret);
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BIO_write(bio, buf, ret);
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free(buf);
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return (ret);
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}
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#endif /* HAVE_FUNOPEN */
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/*
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* BIO_snprintf and BIO_vsnprintf return -1 for overflow,
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* due to the history of this API. Justification:
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*
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* Traditional snprintf surfaced in 4.4BSD, and returned
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* "number of bytes wanted". Solaris and Windows opted to
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* return -1. A draft standard was written which returned -1.
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* Due to the large volume of code already using the first
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* semantics, the draft was repaired before standardization to
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* specify "number of bytes wanted" plus "-1 for character conversion
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* style errors". Solaris adapted to this rule, but Windows stuck
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* with -1.
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*
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* Original OpenSSL comment which is full of lies:
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*
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* "In case of truncation, return -1 like traditional snprintf.
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* (Current drafts for ISO/IEC 9899 say snprintf should return
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* the number of characters that would have been written,
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* had the buffer been large enough.)"
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*/
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int
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BIO_snprintf(char *buf, size_t n, const char *format, ...)
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{
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va_list args;
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int ret;
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va_start(args, format);
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ret = vsnprintf(buf, n, format, args);
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va_end(args);
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if (ret >= n || ret == -1)
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return (-1);
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return (ret);
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}
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int
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BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
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{
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int ret;
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ret = vsnprintf(buf, n, format, args);
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if (ret >= n || ret == -1)
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return (-1);
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return (ret);
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}
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