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1.1 root 1: /*ident "@(#)ctrans:lib/stream/oldformat.c 1.1.4.1" */
2: /**************************************************************************
3: Copyright (c) 1984 AT&T
4: All Rights Reserved
5:
6: THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T
7:
8: The copyright notice above does not evidence any
9: actual or intended publication of such source code.
10:
11: oldformat.c:
12: file for obsolete stream stuff that isn't part of the
13: official iostream package.
14: *****************************************************************************/
15:
16: #include <stream.h>
17: #include "streamdefs.h"
18: #include <string.h>
19: #include <strstream.h>
20: #include <fstream.h>
21: #include <libc.h>
22:
23: #ifdef VSPRINTF
24: # include <stdarg.h>
25: #endif
26:
27: static const int cb_size = 1024 ;
28: static const int fld_size = 256 ;
29:
30: /* a circular formating buffer */
31: static char formbuf[cb_size]; // some slob for form overflow
32: static char* bfree=formbuf;
33: static char* max = &formbuf[cb_size-1];
34:
35: char* chr(register i, register int w) /* note: chr(0) is "" */
36: {
37: register char* buf = bfree;
38:
39: if (w<=0 || fld_size<w) w = 1;
40: w++; /* space for trailing 0 */
41: if (max < buf+w) buf = formbuf;
42: bfree = buf+w;
43: char * res = buf;
44:
45: w -= 2; /* pad */
46: while (w--) *buf++ = ' ';
47: if (i<0 || 127<i) i = ' ';
48: *buf++ = i;
49: *buf = 0;
50: return res;
51: }
52:
53: char* str(const char* s, register int w)
54: {
55: register char* buf = bfree;
56: int ll = strlen(s);
57: if (w<=0 || fld_size<w) w = ll;
58: if (w < ll) ll = w;
59: w++; /* space for traling 0 */
60: if (max < buf+w) buf = formbuf;
61: bfree = buf+w;
62: char* res = buf;
63:
64: w -= (ll+1); /* pad */
65: while (w--) *buf++ = ' ';
66: while (*s) *buf++ = *s++;
67: *buf = 0;
68: return res;
69: }
70:
71: char* form(const char* format ...)
72: {
73: register char* buf = bfree;
74: if (max < buf+fld_size) buf = formbuf;
75:
76: # ifdef VSPRINTF
77: va_list args ;
78: va_start(args,format) ;
79: VSPRINTF(buf,format,args) ;
80: va_end(args) ;
81: # else
82: // not very portable
83: register* ap = (int*)((char*)&format+sizeof(char*));
84: sprintf(buf,format,ap[0],ap[1],ap[2],ap[3],ap[4],ap[5],ap[6],ap[7],ap[8],ap[9]);
85: # endif
86:
87: register ll = strlen(buf); // not all sprintf's return length
88: if (0<ll && ll<cb_size) // length
89: ;
90: else if (buf<(char*)ll && (char*)ll<buf+cb_size)// pointer to trailing 0
91: ll = (char*)ll - buf;
92: else
93: ll = strlen(buf);
94:
95: // If we have scribbled beyond the end of the buffer then
96: // who knows what data we've destroyed. Better to abort here
97: // here there is some chance that somebody can associate
98: // the location with the error than to continue and die
99: // a mysterious death later.
100: if (fld_size < ll) abort();
101:
102: bfree = buf+ll+1;
103: return buf;
104: }
105:
106: const char a10 = 'a'-10;
107:
108: char* hex(long ii, register w)
109: {
110: int m = sizeof(long)*2; // maximum hex digits for a long
111: if (w<0 || fld_size<w) w = 0;
112: int sz = (w?w:m)+1;
113: register char* buf = bfree;
114: if (max < buf+sz) buf = formbuf;
115: register char* p = buf+sz;
116: bfree = p+1;
117: *p-- = 0; // trailing 0
118: register unsigned long i = ii;
119:
120: if (w) {
121: do {
122: register h = (int)(i&0xf);
123: *p-- = (h < 10) ? h+'0' : h+a10;
124: } while (--w && (i>>=4));
125: while (0<w--) *p-- = ' ';
126: }
127: else {
128: do {
129: register h = (int)(i&0xf);
130: *p-- = (h < 10) ? h+'0' : h+a10;
131: } while (i>>=4);
132: }
133: return p+1;
134: }
135:
136: char* oct(long ii, int w)
137: {
138: int m = sizeof(long)*3; // maximum oct digits for a long
139: if (w<0 || fld_size<w) w = 0;
140: int sz = (w?w:m)+1;
141: register char* buf = bfree;
142: if (max < buf+sz) buf = formbuf;
143: register char* p = buf+sz;
144: bfree = p+1;
145: *p-- = 0; // trailing 0
146: register unsigned long i = ii;
147:
148: if (w) {
149: do {
150: register h = (int)(i&07);
151: *p-- = h + '0';
152: } while (--w && (i>>=3));
153: while (0<w--) *p-- = ' ';
154: }
155: else {
156: do {
157: register h = (int)(i&07);
158: *p-- = h+'0';
159: } while (i>>=3);
160: }
161:
162: return p+1;
163: }
164:
165: char* dec(long i, int w)
166: {
167: int sign = 0;
168: if (i < 0) {
169: sign = 1;
170: i = -i;
171: }
172: int m = sizeof(long)*3; /* maximum dec digits for a long */
173: if (w<0 || fld_size<w) w = 0;
174: int sz = (w?w:m)+1;
175: register char* buf = bfree;
176: if (max < buf+sz) buf = formbuf;
177: register char* p = buf+sz;
178: bfree = p+1;
179: *p-- = 0; /* trailing 0 */
180:
181: if (w) {
182: do {
183: register h = (int)(i%10);
184: *p-- = h + '0';
185: } while (--w && (i/=10));
186: if (sign && 0<w) {
187: w--;
188: *p-- = '-';
189: }
190: while (0<w--) *p-- = ' ';
191: }
192: else {
193: do {
194: register h = (int)(i%10);
195: *p-- = h + '0';
196: } while (i/=10);
197: if (sign) *p-- = '-';
198: }
199:
200: return p+1;
201: }
202:
203: istream& WS(istream& i) { return i >> ws ; }
204:
205: void eatwhite(istream& i) { i >> ws ; }
206:
207: istream::istream(streambuf* b, int sk, ostream* t)
208: {
209: init(b) ;
210: skip(sk) ;
211: tie(t) ;
212: }
213:
214: istream::istream(int len, char* b, int sk)
215: {
216: init( new streambuf(b,len,-len) ) ;
217: delbuf = 1 ;
218: skip(sk) ;
219: }
220:
221: istream::istream(int fd, int sk, ostream* t)
222: {
223: init( new filebuf(fd) ) ;
224: delbuf = 1 ;
225: skip(sk) ;
226: tie(t) ;
227: }
228:
229: ostream::ostream(int fd)
230: {
231: init( new filebuf(fd) ) ;
232: delbuf = 1 ;
233: }
234:
235: ostream::ostream(int len, char* b)
236: {
237: init( new streambuf(b,len,0) ) ;
238: delbuf = 1 ;
239: }
240:
241: streambuf::streambuf(char* p, int l, int c ) :
242: x_unbuf(0), alloc(0)
243: {
244: setb(0,0,0);
245: setbuf(p,l,c) ;
246: }
247:
248: streambuf* streambuf::setbuf(char* p, int len, int count)
249: {
250: // Three argument setbuf for compatibility with old
251: // stream package.
252: if ( x_base ) return 0 ;
253: if ( len <= 0 || p == 0 ) {
254: // make it unbuffered
255: setb(0,0,0) ;
256: setg(0,0,0) ;
257: setp(0,0);
258: unbuffered(1) ;
259: } else if ( count >= 0 ) {
260: setb(p,p+len,0) ;
261: setg(p,p,p+count) ;
262: setp(p+count,p+len) ;
263: unbuffered(0) ;
264: } else { // count < 0
265: // Special case,
266: // Used by iostream::iostream(char*,int)
267: // For backwards compatibility with old streams
268: setb(p,p+len,0) ;
269: setg(p,p,p-count) ;
270: setp(p,p+len) ;
271: unbuffered(0) ;
272: }
273: return this;
274: }
275:
276: int ios::skip(int sk)
277: {
278: long f ;
279: if ( sk ) f = setf(skipws,skipws) ;
280: else f = setf(0,skipws) ;
281:
282: return (f&skipws) != 0 ;
283: }
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