1 /* __gmp_sprintf_funs -- support for gmp_sprintf and gmp_vsprintf. 2 3 THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST 4 CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN 5 FUTURE GNU MP RELEASES. 6 7 Copyright 2001 Free Software Foundation, Inc. 8 9 This file is part of the GNU MP Library. 10 11 The GNU MP Library is free software; you can redistribute it and/or modify 12 it under the terms of the GNU Lesser General Public License as published by 13 the Free Software Foundation; either version 3 of the License, or (at your 14 option) any later version. 15 16 The GNU MP Library is distributed in the hope that it will be useful, but 17 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 18 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 19 License for more details. 20 21 You should have received a copy of the GNU Lesser General Public License 22 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 23 24 #include "config.h" 25 26 #if HAVE_STDARG 27 #include <stdarg.h> 28 #else 29 #include <varargs.h> 30 #endif 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include "gmp.h" 37 #include "gmp-impl.h" 38 39 40 /* The data parameter "bufp" points to a "char *buf" which is the next 41 character to be written, having started as the destination from the 42 application. This is then increased each time output is produced. */ 43 44 45 /* If vsprintf returns -1 then pass it upwards. It doesn't matter that 46 "*bufp" is ruined in this case, since gmp_doprint will bail out 47 immediately anyway. */ 48 static int 49 gmp_sprintf_format (char **bufp, const char *fmt, va_list ap) 50 { 51 char *buf = *bufp; 52 int ret; 53 vsprintf (buf, fmt, ap); 54 ret = strlen (buf); 55 *bufp = buf + ret; 56 return ret; 57 } 58 59 static int 60 gmp_sprintf_memory (char **bufp, const char *str, size_t len) 61 { 62 char *buf = *bufp; 63 *bufp = buf + len; 64 memcpy (buf, str, len); 65 return len; 66 } 67 68 static int 69 gmp_sprintf_reps (char **bufp, int c, int reps) 70 { 71 char *buf = *bufp; 72 ASSERT (reps >= 0); 73 *bufp = buf + reps; 74 memset (buf, c, reps); 75 return reps; 76 } 77 78 static int 79 gmp_sprintf_final (char **bufp, int c, int reps) 80 { 81 char *buf = *bufp; 82 *buf = '\0'; 83 return 0; 84 } 85 86 const struct doprnt_funs_t __gmp_sprintf_funs = { 87 (doprnt_format_t) gmp_sprintf_format, 88 (doprnt_memory_t) gmp_sprintf_memory, 89 (doprnt_reps_t) gmp_sprintf_reps, 90 (doprnt_final_t) gmp_sprintf_final 91 }; 92