1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2009 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #include "sfhdr.h" 23 24 /* Open a file/string for IO. 25 ** If f is not nil, it is taken as an existing stream that should be 26 ** closed and its structure reused for the new stream. 27 ** 28 ** Written by Kiem-Phong Vo. 29 */ 30 31 #if _BLD_sfio && defined(__EXPORT__) 32 #define extern __EXPORT__ 33 #endif 34 extern 35 #undef extern 36 37 #if __STD_C 38 Sfio_t* _sfopen(Sfio_t* f, const char* file, const char* mode) 39 #else 40 Sfio_t* _sfopen(f,file,mode) 41 Sfio_t* f; /* old stream structure */ 42 char* file; /* file/string to be opened */ 43 char* mode; /* mode of the stream */ 44 #endif 45 { 46 int fd, oldfd, oflags, sflags; 47 SFMTXDECL(f); 48 49 /* get the control flags */ 50 if((sflags = _sftype(mode,&oflags,NIL(int*))) == 0) 51 return NIL(Sfio_t*); 52 53 /* changing the control flags */ 54 if(f && !file && !((f->flags|sflags)&SF_STRING) ) 55 { SFMTXENTER(f, NIL(Sfio_t*)); 56 57 if(f->mode&SF_INIT ) /* stream uninitialized, ok to set flags */ 58 { f->flags |= (sflags & (SF_FLAGS & ~SF_RDWR)); 59 60 if((sflags &= SF_RDWR) != 0) /* reset read/write modes */ 61 { f->flags = (f->flags & ~SF_RDWR) | sflags; 62 63 if((f->flags&SF_RDWR) == SF_RDWR) 64 f->bits |= SF_BOTH; 65 else f->bits &= ~SF_BOTH; 66 67 if(f->flags&SF_READ) 68 f->mode = (f->mode&~SF_WRITE)|SF_READ; 69 else f->mode = (f->mode&~SF_READ)|SF_WRITE; 70 } 71 } 72 else /* make sure there is no buffered data */ 73 { if(sfsync(f) < 0) 74 SFMTXRETURN(f,NIL(Sfio_t*)); 75 } 76 77 if(f->file >= 0 && (oflags &= (O_TEXT|O_BINARY|O_APPEND)) != 0 ) 78 { /* set file access control */ 79 int ctl = sysfcntlf(f->file, F_GETFL, 0); 80 ctl = (ctl & ~(O_TEXT|O_BINARY|O_APPEND)) | oflags; 81 sysfcntlf(f->file, F_SETFL, ctl); 82 } 83 84 SFMTXRETURN(f,f); 85 } 86 87 if(sflags&SF_STRING) 88 { f = sfnew(f,(char*)file, 89 file ? (size_t)strlen((char*)file) : (size_t)SF_UNBOUND, 90 -1,sflags); 91 } 92 else 93 { if(!file) 94 return NIL(Sfio_t*); 95 96 #if _has_oflags /* open the file */ 97 while((fd = sysopenf((char*)file,oflags,SF_CREATMODE)) < 0 && errno == EINTR) 98 errno = 0; 99 #else 100 while((fd = sysopenf(file,oflags&O_ACCMODE)) < 0 && errno == EINTR) 101 errno = 0; 102 if(fd >= 0) 103 { if((oflags&(O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) ) 104 { CLOSE(fd); /* error: file already exists */ 105 return NIL(Sfio_t*); 106 } 107 if(oflags&O_TRUNC ) /* truncate file */ 108 { reg int tf; 109 while((tf = syscreatf(file,SF_CREATMODE)) < 0 && 110 errno == EINTR) 111 errno = 0; 112 CLOSE(tf); 113 } 114 } 115 else if(oflags&O_CREAT) 116 { while((fd = syscreatf(file,SF_CREATMODE)) < 0 && errno == EINTR) 117 errno = 0; 118 if((oflags&O_ACCMODE) != O_WRONLY) 119 { /* the file now exists, reopen it for read/write */ 120 CLOSE(fd); 121 while((fd = sysopenf(file,oflags&O_ACCMODE)) < 0 && 122 errno == EINTR) 123 errno = 0; 124 } 125 } 126 #endif 127 if(fd < 0) 128 return NIL(Sfio_t*); 129 130 /* we may have to reset the file descriptor to its old value */ 131 oldfd = f ? f->file : -1; 132 if((f = sfnew(f,NIL(char*),(size_t)SF_UNBOUND,fd,sflags)) && oldfd >= 0) 133 (void)sfsetfd(f,oldfd); 134 } 135 136 return f; 137 } 138 139 #if __STD_C 140 int _sftype(reg const char* mode, int* oflagsp, int* uflagp) 141 #else 142 int _sftype(mode, oflagsp, uflagp) 143 reg char* mode; 144 int* oflagsp; 145 int* uflagp; 146 #endif 147 { 148 reg int sflags, oflags, uflag; 149 150 if(!mode) 151 return 0; 152 153 /* construct the open flags */ 154 sflags = oflags = uflag = 0; 155 while(1) switch(*mode++) 156 { 157 case 'a' : 158 sflags |= SF_WRITE | SF_APPENDWR; 159 oflags |= O_WRONLY | O_APPEND | O_CREAT; 160 continue; 161 case 'b' : 162 oflags |= O_BINARY; 163 continue; 164 case 'm' : 165 sflags |= SF_MTSAFE; 166 uflag = 0; 167 continue; 168 case 'r' : 169 sflags |= SF_READ; 170 oflags |= O_RDONLY; 171 continue; 172 case 's' : 173 sflags |= SF_STRING; 174 continue; 175 case 't' : 176 oflags |= O_TEXT; 177 continue; 178 case 'u' : 179 sflags &= ~SF_MTSAFE; 180 uflag = 1; 181 continue; 182 case 'w' : 183 sflags |= SF_WRITE; 184 oflags |= O_WRONLY | O_CREAT; 185 if(!(sflags&SF_READ)) 186 oflags |= O_TRUNC; 187 continue; 188 case 'x' : 189 oflags |= O_EXCL; 190 continue; 191 case 'F': 192 /* stdio compatibility -- fd >= FOPEN_MAX (or other magic number) ok */ 193 continue; 194 case 'W' : 195 sflags |= SF_WCWIDTH; 196 uflag = 0; 197 continue; 198 case '+' : 199 if(sflags) 200 sflags |= SF_READ|SF_WRITE; 201 continue; 202 default : 203 if(!(oflags&O_CREAT) ) 204 oflags &= ~O_EXCL; 205 #if _WIN32 && !_WINIX 206 if(!(oflags&(O_BINARY|O_TEXT))) 207 oflags |= O_BINARY; 208 #endif 209 if((sflags&SF_RDWR) == SF_RDWR) 210 oflags = (oflags&~O_ACCMODE)|O_RDWR; 211 if(oflagsp) 212 *oflagsp = oflags; 213 if(uflagp) 214 *uflagp = uflag; 215 if((sflags&(SF_STRING|SF_RDWR)) == SF_STRING) 216 sflags |= SF_READ; 217 return sflags; 218 } 219 } 220