lib/libcrypto/bio/b_print.c

   1 /* $OpenBSD: b_print.c,v 1.25 2014/06/12 15:49:28 deraadt Exp $ */
   2
   3 /* Theo de Raadt places this file in the public domain. */
   4
   5 #include <openssl/bio.h>
   6
   7 int
   8 BIO_printf(BIO *bio, const char *format, ...)
   9 {
  10         va_list args;
  11         int ret;
  12
  13         va_start(args, format);
  14         ret = BIO_vprintf(bio, format, args);
  15         va_end(args);
  16         return (ret);
  17 }
  18
  19 #ifdef HAVE_FUNOPEN
  20 static int
  21 _BIO_write(void *cookie, const char *buf, int nbytes)
  22 {
  23         return BIO_write(cookie, buf, nbytes);
  24 }
  25
  26 int
  27 BIO_vprintf(BIO *bio, const char *format, va_list args)
  28 {
  29         int ret;
  30         FILE *fp;
  31
  32         fp = funopen(bio, NULL, &_BIO_write, NULL, NULL);
  33         if (fp == NULL) {
  34                 ret = -1;
  35                 goto fail;
  36         }
  37         ret = vfprintf(fp, format, args);
  38         fclose(fp);
  39 fail:
  40         return (ret);
  41 }
  42
  43 #else /* !HAVE_FUNOPEN */
  44
  45 int
  46 BIO_vprintf(BIO *bio, const char *format, va_list args)
  47 {
  48         int ret;
  49         char *buf = NULL;
  50
  51         ret = vasprintf(&buf, format, args);
  52         if (buf == NULL) {
  53                 ret = -1;
  54                 goto fail;
  55         }
  56         BIO_write(bio, buf, ret);
  57         free(buf);
  58 fail:
  59         return (ret);
  60 }
  61
  62 #endif /* HAVE_FUNOPEN */
  63
  64 /*
  65  * BIO_snprintf and BIO_vsnprintf return -1 for overflow,
  66  * due to the history of this API.  Justification:
  67  *
  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
  75  * with -1.
  76  *
  77  * Original OpenSSL comment which is full of lies:
  78  *
  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.)"
  83  */
  84 int
  85 BIO_snprintf(char *buf, size_t n, const char *format, ...)
  86 {
  87         va_list args;
  88         int ret;
  89
  90         va_start(args, format);
  91         ret = vsnprintf(buf, n, format, args);
  92         va_end(args);
  93
  94         if (ret >= n || ret == -1)
  95                 return (-1);
  96         return (ret);
  97 }
  98
  99 int
 100 BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
 101 {
 102         int ret;
 103
 104         ret = vsnprintf(buf, n, format, args);
 105
 106         if (ret >= n || ret == -1)
 107                 return (-1);
 108         return (ret);
 109 }