1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2011 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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*
_stdgets(Sfio_t * f,char * us,int n,int isgets)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*
fgets(char * s,int n,Sfio_t * f)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*
gets(char * s)107 gets(char* s)
108 {
109 return _stdgets(sfstdin, s, BUFSIZ, 1);
110 }
111