2 * Copyright (C) 2001 MontaVista Software Inc.
3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
15 #define IsDigit(x) ( ((x) >= '0') && ((x) <= '9') )
16 #define Ctod(x) ( (x) - '0')
18 /* forward declaration */
19 extern int PrintChar(char *, char, int, int);
20 extern int PrintString(char *, char *, int, int);
21 extern int PrintNum(char *, unsigned long, int, int, int, int, char, int);
23 /* private variable */
24 static const char theFatalMsg
[] = "fatal error in lp_Print!";
27 * A low level printf() function.
30 lp_Print(void (*output
)(void *, char *, int),
36 #define OUTPUT(arg, s, l) \
37 { if (((l) < 0) || ((l) > LP_MAX_BUF)) { \
38 (*output)(arg, (char*)theFatalMsg, sizeof(theFatalMsg)-1); for(;;); \
40 (*output)(arg, s, l); \
61 /* scan for the next '%' */
63 while ( (*fmt
!= '\0') && (*fmt
!= '%')) {
67 /* flush the string found so far */
68 OUTPUT(arg
, fmtStart
, fmt
-fmtStart
);
70 /* are we hitting the end? */
71 if (*fmt
== '\0') break;
85 /* check for other prefixes */
102 while (IsDigit(*fmt
)) {
103 width
= 10 * width
+ Ctod(*fmt
++);
111 while (IsDigit(*fmt
)) {
112 prec
= prec
*10 + Ctod(*fmt
++);
118 /* check format flag */
123 num
= va_arg(ap
, long int);
125 num
= va_arg(ap
, int);
127 length
= PrintNum(buf
, num
, 2, 0, width
, ladjust
, padc
, 0);
128 OUTPUT(arg
, buf
, length
);
134 num
= va_arg(ap
, long int);
136 num
= va_arg(ap
, int);
142 length
= PrintNum(buf
, num
, 10, negFlag
, width
, ladjust
, padc
, 0);
143 OUTPUT(arg
, buf
, length
);
149 num
= va_arg(ap
, long int);
151 num
= va_arg(ap
, int);
153 length
= PrintNum(buf
, num
, 8, 0, width
, ladjust
, padc
, 0);
154 OUTPUT(arg
, buf
, length
);
160 num
= va_arg(ap
, long int);
162 num
= va_arg(ap
, int);
164 length
= PrintNum(buf
, num
, 10, 0, width
, ladjust
, padc
, 0);
165 OUTPUT(arg
, buf
, length
);
170 num
= va_arg(ap
, long int);
172 num
= va_arg(ap
, int);
174 length
= PrintNum(buf
, num
, 16, 0, width
, ladjust
, padc
, 0);
175 OUTPUT(arg
, buf
, length
);
180 num
= va_arg(ap
, long int);
182 num
= va_arg(ap
, int);
184 length
= PrintNum(buf
, num
, 16, 0, width
, ladjust
, padc
, 1);
185 OUTPUT(arg
, buf
, length
);
189 c
= (char)va_arg(ap
, int);
190 length
= PrintChar(buf
, c
, width
, ladjust
);
191 OUTPUT(arg
, buf
, length
);
195 s
= (char*)va_arg(ap
, char *);
196 length
= PrintString(buf
, s
, width
, ladjust
);
197 OUTPUT(arg
, buf
, length
);
205 /* output this char as it is */
207 } /* switch (*fmt) */
212 /* special termination call */
213 OUTPUT(arg
, "\0", 1);
217 /* --------------- local help functions --------------------- */
219 PrintChar(char * buf
, char c
, int length
, int ladjust
)
223 if (length
< 1) length
= 1;
226 for (i
=1; i
< length
; i
++) buf
[i
] = ' ';
228 for (i
=0; i
< length
-1; i
++) buf
[i
] = ' ';
235 PrintString(char * buf
, char* s
, int length
, int ladjust
)
241 if (length
< len
) length
= len
;
244 for (i
=0; i
< len
; i
++) buf
[i
] = s
[i
];
245 for (i
=len
; i
< length
; i
++) buf
[i
] = ' ';
247 for (i
=0; i
< length
-len
; i
++) buf
[i
] = ' ';
248 for (i
=length
-len
; i
< length
; i
++) buf
[i
] = s
[i
-length
+len
];
254 PrintNum(char * buf
, unsigned long u
, int base
, int negFlag
,
255 int length
, int ladjust
, char padc
, int upcase
)
258 * 1. prints the number from left to right in reverse form.
259 * 2. fill the remaining spaces with padc if length is longer than
261 * TRICKY : if left adjusted, no "0" padding.
262 * if negtive, insert "0" padding between "0" and number.
263 * 3. if (!ladjust) we reverse the whole string including paddings
264 * 4. otherwise we only reverse the actual string representing the num.
276 *p
++ = 'A' + tmp
- 10;
278 *p
++ = 'a' + tmp
- 10;
287 /* figure out actual length and adjust the maximum length */
288 actualLength
= p
- buf
;
289 if (length
< actualLength
) length
= actualLength
;
295 if (negFlag
&& !ladjust
&& (padc
== '0')) {
296 for (i
= actualLength
-1; i
< length
-1; i
++) buf
[i
] = padc
;
297 buf
[length
-1] = '-';
299 for (i
= actualLength
; i
< length
; i
++) buf
[i
] = padc
;
303 /* prepare to reverse the string */
308 end
= actualLength
- 1;
313 while (end
> begin
) {
314 char tmp
= buf
[begin
];
315 buf
[begin
] = buf
[end
];
322 /* adjust the string pointer */
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