1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 #pragma prototyped 23 24 #include "stdhdr.h" 25 26 extern char* 27 _stdgets(Sfio_t* f, char* us, int n, int isgets) 28 { 29 int p; 30 unsigned char* is; 31 unsigned char* ps; 32 33 if(n <= 0 || !us || (f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)) 34 return NIL(char*); 35 36 SFLOCK(f,0); 37 38 n -= 1; 39 is = (uchar*)us; 40 41 while(n) 42 { /* peek the read buffer for data */ 43 if((p = f->endb - (ps = f->next)) <= 0 ) 44 { f->getr = '\n'; 45 f->mode |= SF_RC; 46 if(SFRPEEK(f,ps,p) <= 0) 47 break; 48 } 49 50 if(p > n) 51 p = n; 52 53 #if _lib_memccpy 54 if((ps = (uchar*)memccpy((char*)is,(char*)ps,'\n',p)) != NIL(uchar*)) 55 p = ps-is; 56 is += p; 57 ps = f->next+p; 58 #else 59 if(!(f->flags&(SF_BOTH|SF_MALLOC))) 60 { while(p-- && (*is++ = *ps++) != '\n') 61 ; 62 p = ps-f->next; 63 } 64 else 65 { reg int c = ps[p-1]; 66 if(c != '\n') 67 ps[p-1] = '\n'; 68 while((*is++ = *ps++) != '\n') 69 ; 70 if(c != '\n') 71 { f->next[p-1] = c; 72 if((ps-f->next) >= p) 73 is[-1] = c; 74 } 75 } 76 #endif 77 78 /* gobble up read data and continue */ 79 f->next = ps; 80 if(is[-1] == '\n') 81 break; 82 else if(n > 0) 83 n -= p; 84 } 85 86 if((_Sfi = is - ((uchar*)us)) <= 0) 87 us = NIL(char*); 88 else if(isgets && is[-1] == '\n') 89 { is[-1] = '\0'; 90 _Sfi -= 1; 91 } 92 else *is = '\0'; 93 94 SFOPEN(f,0); 95 return us; 96 } 97 98 char* 99 fgets(char* s, int n, Sfio_t* f) 100 { 101 STDIO_PTR(f, "fgets", char*, (char*, int, Sfio_t*), (s, n, f)) 102 103 return _stdgets(f, s, n, 0); 104 } 105 106 char* 107 gets(char* s) 108 { 109 return _stdgets(sfstdin, s, BUFSIZ, 1); 110 } 111