1 /* __gmp_sscanf_funs -- support for formatted input from a string. 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, 2002, 2003, 2009 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 <stdio.h> 25 #include <stdarg.h> 26 #include "gmp.h" 27 #include "gmp-impl.h" 28 29 30 #if 0 31 static int 32 scan (const char **sp, const char *fmt, ...) 33 { 34 va_list ap; 35 int ret; 36 37 va_start(ap, fmt); 38 ret = vsscanf(*sp, fmt, ap); 39 va_end(ap); 40 41 return ret; 42 } 43 #else 44 static int 45 scan (const char **sp, const char *fmt, ...) 46 { 47 va_list ap; 48 void *p1, *p2; 49 int ret; 50 51 va_start (ap, fmt); 52 p1 = va_arg (ap, void *); 53 p2 = va_arg (ap, void *); 54 55 ret = sscanf (*sp, fmt, p1, p2); 56 57 va_end (ap); 58 59 return ret; 60 } 61 #endif 62 63 static void 64 step (const char **sp, int n) 65 { 66 ASSERT (n >= 0); 67 68 /* shouldn't push us past the end of the string */ 69 #if WANT_ASSERT 70 { 71 int i; 72 for (i = 0; i < n; i++) 73 ASSERT ((*sp)[i] != '\0'); 74 } 75 #endif 76 77 (*sp) += n; 78 } 79 80 static int 81 get (const char **sp) 82 { 83 const char *s; 84 int c; 85 s = *sp; 86 c = (unsigned char) *s++; 87 if (c == '\0') 88 return EOF; 89 *sp = s; 90 return c; 91 } 92 93 static void 94 unget (int c, const char **sp) 95 { 96 const char *s; 97 s = *sp; 98 if (c == EOF) 99 { 100 ASSERT (*s == '\0'); 101 return; 102 } 103 s--; 104 ASSERT ((unsigned char) *s == c); 105 *sp = s; 106 } 107 108 const struct gmp_doscan_funs_t __gmp_sscanf_funs = { 109 (gmp_doscan_scan_t) scan, 110 (gmp_doscan_step_t) step, 111 (gmp_doscan_get_t) get, 112 (gmp_doscan_unget_t) unget, 113 }; 114