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179f9ab4 C |
1 | /* print.c -- formatted printing routines (Paul Haahr, 12/91) */ |
2 | ||
3 | #include "rc.h" | |
4 | #include <setjmp.h> | |
5 | ||
6 | #define PRINT_ALLOCSIZE ((size_t)64) | |
7 | #define SPRINT_BUFSIZ ((size_t)1024) | |
8 | ||
9 | #define MAXCONV 256 | |
10 | ||
11 | /* | |
12 | * conversion functions | |
13 | * true return -> flag changes only, not a conversion | |
14 | */ | |
15 | ||
16 | #define Flag(name, flag) \ | |
17 | static bool name(Format *format, int c) { \ | |
18 | format->flags |= flag; \ | |
19 | return TRUE; \ | |
20 | } | |
21 | ||
22 | Flag(uconv, FMT_unsigned) | |
23 | Flag(hconv, FMT_short) | |
24 | Flag(lconv, FMT_long) | |
25 | Flag(altconv, FMT_altform) | |
26 | Flag(leftconv, FMT_leftside) | |
27 | Flag(dotconv, FMT_f2set) | |
28 | ||
29 | static bool digitconv(Format *format, int c) { | |
30 | if (format->flags & FMT_f2set) | |
31 | format->f2 = 10 * format->f2 + c - '0'; | |
32 | else { | |
33 | format->flags |= FMT_f1set; | |
34 | format->f1 = 10 * format->f1 + c - '0'; | |
35 | } | |
36 | return TRUE; | |
37 | } | |
38 | ||
39 | static bool zeroconv(Format *format, int c) { | |
40 | if (format->flags & (FMT_f1set | FMT_f2set)) | |
41 | return digitconv(format, '0'); | |
42 | format->flags |= FMT_zeropad; | |
43 | return TRUE; | |
44 | } | |
45 | ||
46 | static void pad(Format *format, size_t len, int c) { | |
47 | while (len-- != 0) | |
48 | fmtputc(format, c); | |
49 | } | |
50 | ||
51 | static bool sconv(Format *format, int c) { | |
52 | char *s = va_arg(format->args, char *); | |
53 | if ((format->flags & FMT_f1set) == 0) | |
54 | fmtcat(format, s); | |
55 | else { | |
56 | size_t len = strlen(s), width = format->f1 - len; | |
57 | if (format->flags & FMT_leftside) { | |
58 | fmtappend(format, s, len); | |
59 | pad(format, width, ' '); | |
60 | } else { | |
61 | pad(format, width, ' '); | |
62 | fmtappend(format, s, len); | |
63 | } | |
64 | } | |
65 | return FALSE; | |
66 | } | |
67 | ||
68 | static char *utoa(unsigned long u, char *t, unsigned int radix, const char *digit) { | |
69 | if (u >= radix) { | |
70 | t = utoa(u / radix, t, radix, digit); | |
71 | u %= radix; | |
72 | } | |
73 | *t++ = digit[u]; | |
74 | return t; | |
75 | } | |
76 | ||
77 | static void intconv(Format *format, unsigned int radix, int upper, const char *altform) { | |
78 | static const char * const table[] = { | |
79 | "0123456789abcdefghijklmnopqrstuvwxyz", | |
80 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ", | |
81 | }; | |
82 | char padchar; | |
83 | size_t len, pre, zeroes, padding, width; | |
84 | long n, flags; | |
85 | unsigned long u; | |
86 | char number[64], prefix[20]; | |
87 | ||
88 | if (radix > 36) | |
89 | return; | |
90 | ||
91 | flags = format->flags; | |
92 | if (flags & FMT_long) | |
93 | n = va_arg(format->args, long); | |
94 | else if (flags & FMT_short) | |
95 | n = va_arg(format->args, short); | |
96 | else | |
97 | n = va_arg(format->args, int); | |
98 | ||
99 | pre = 0; | |
100 | if ((flags & FMT_unsigned) || n >= 0) | |
101 | u = n; | |
102 | else { | |
103 | prefix[pre++] = '-'; | |
104 | u = -n; | |
105 | } | |
106 | ||
107 | if (flags & FMT_altform) | |
108 | while (*altform != '\0') | |
109 | prefix[pre++] = *altform++; | |
110 | ||
111 | len = utoa(u, number, radix, table[upper]) - number; | |
112 | if ((flags & FMT_f2set) && (size_t) format->f2 > len) | |
113 | zeroes = format->f2 - len; | |
114 | else | |
115 | zeroes = 0; | |
116 | ||
117 | width = pre + zeroes + len; | |
118 | if ((flags & FMT_f1set) && (size_t) format->f1 > width) { | |
119 | padding = format->f1 - width; | |
120 | } else | |
121 | padding = 0; | |
122 | ||
123 | padchar = ' '; | |
124 | if (padding > 0 && flags & FMT_zeropad) { | |
125 | padchar = '0'; | |
126 | if ((flags & FMT_leftside) == 0) { | |
127 | zeroes += padding; | |
128 | padding = 0; | |
129 | } | |
130 | } | |
131 | ||
132 | ||
133 | if ((flags & FMT_leftside) == 0) | |
134 | pad(format, padding, padchar); | |
135 | fmtappend(format, prefix, pre); | |
136 | pad(format, zeroes, '0'); | |
137 | fmtappend(format, number, len); | |
138 | if (flags & FMT_leftside) | |
139 | pad(format, padding, padchar); | |
140 | } | |
141 | ||
142 | static bool cconv(Format *format, int c) { | |
143 | fmtputc(format, va_arg(format->args, int)); | |
144 | return FALSE; | |
145 | } | |
146 | ||
147 | static bool dconv(Format *format, int c) { | |
148 | intconv(format, 10, 0, ""); | |
149 | return FALSE; | |
150 | } | |
151 | ||
152 | static bool oconv(Format *format, int c) { | |
153 | intconv(format, 8, 0, "0"); | |
154 | return FALSE; | |
155 | } | |
156 | ||
157 | static bool xconv(Format *format, int c) { | |
158 | intconv(format, 16, 0, "0x"); | |
159 | return FALSE; | |
160 | } | |
161 | ||
162 | static bool pctconv(Format *format, int c) { | |
163 | fmtputc(format, '%'); | |
164 | return FALSE; | |
165 | } | |
166 | ||
167 | static bool badconv(Format *format, int c) { | |
168 | panic("bad conversion character in printfmt"); | |
169 | /* NOTREACHED */ | |
170 | return FALSE; /* hush up gcc -Wall */ | |
171 | } | |
172 | ||
173 | ||
174 | /* | |
175 | * conversion table management | |
176 | */ | |
177 | ||
178 | static Conv fmttab[MAXCONV]; | |
179 | ||
180 | static void inittab(void) { | |
181 | int i; | |
182 | for (i = 0; i < MAXCONV; i++) | |
183 | fmttab[i] = badconv; | |
184 | ||
185 | fmttab['s'] = sconv; | |
186 | fmttab['c'] = cconv; | |
187 | fmttab['d'] = dconv; | |
188 | fmttab['o'] = oconv; | |
189 | fmttab['x'] = xconv; | |
190 | fmttab['%'] = pctconv; | |
191 | ||
192 | fmttab['u'] = uconv; | |
193 | fmttab['h'] = hconv; | |
194 | fmttab['l'] = lconv; | |
195 | fmttab['#'] = altconv; | |
196 | fmttab['-'] = leftconv; | |
197 | fmttab['.'] = dotconv; | |
198 | ||
199 | fmttab['0'] = zeroconv; | |
200 | for (i = '1'; i <= '9'; i++) | |
201 | fmttab[i] = digitconv; | |
202 | } | |
203 | ||
204 | extern bool (*fmtinstall(int c, bool (*f)(Format *, int)))(Format *, int) { | |
205 | /*Conv fmtinstall(int c, Conv f) {*/ | |
206 | Conv oldf; | |
207 | if (fmttab[0] == NULL) | |
208 | inittab(); | |
209 | c &= MAXCONV - 1; | |
210 | oldf = fmttab[c]; | |
211 | if (f != NULL) | |
212 | fmttab[c] = f; | |
213 | return oldf; | |
214 | } | |
215 | ||
216 | ||
217 | /* | |
218 | * functions for inserting strings in the format buffer | |
219 | */ | |
220 | ||
221 | extern void fmtappend(Format *format, const char *s, size_t len) { | |
222 | while (format->buf + len > format->bufend) { | |
223 | size_t split = format->bufend - format->buf; | |
224 | memcpy(format->buf, s, split); | |
225 | format->buf += split; | |
226 | s += split; | |
227 | len -= split; | |
228 | (*format->grow)(format, len); | |
229 | } | |
230 | memcpy(format->buf, s, len); | |
231 | format->buf += len; | |
232 | } | |
233 | ||
234 | extern void fmtcat(Format *format, const char *s) { | |
235 | fmtappend(format, s, strlen(s)); | |
236 | } | |
237 | ||
238 | /* | |
239 | * printfmt -- the driver routine | |
240 | */ | |
241 | ||
242 | extern int printfmt(Format *format, const char *fmt) { | |
243 | unsigned const char *s = (unsigned const char *) fmt; | |
244 | ||
245 | if (fmttab[0] == NULL) | |
246 | inittab(); | |
247 | ||
248 | for (;;) { | |
249 | int c = *s++; | |
250 | switch (c) { | |
251 | case '%': | |
252 | format->flags = format->f1 = format->f2 = 0; | |
253 | do | |
254 | c = *s++; | |
255 | while ((*fmttab[c])(format, c)); | |
256 | break; | |
257 | case '\0': | |
258 | return format->buf - format->bufbegin + format->flushed; | |
259 | default: | |
260 | fmtputc(format, c); | |
261 | break; | |
262 | } | |
263 | } | |
264 | } | |
265 | ||
266 | ||
267 | /* | |
268 | * the public entry points | |
269 | */ | |
270 | ||
271 | extern int fmtprint(Format *format, const char *fmt,...) { | |
272 | int n = -format->flushed; | |
273 | va_list saveargs = format->args; | |
274 | ||
275 | va_start(format->args, fmt); | |
276 | n += printfmt(format, fmt); | |
277 | va_end(format->args); | |
278 | format->args = saveargs; | |
279 | ||
280 | return n + format->flushed; | |
281 | } | |
282 | ||
283 | static void fprint_flush(Format *format, size_t more) { | |
284 | size_t n = format->buf - format->bufbegin; | |
285 | char *buf = format->bufbegin; | |
286 | ||
287 | format->flushed += n; | |
288 | format->buf = format->bufbegin; | |
289 | writeall(format->u.n, buf, n); | |
290 | } | |
291 | ||
292 | extern int fprint(int fd, const char *fmt,...) { | |
293 | char buf[1024]; | |
294 | Format format; | |
295 | ||
296 | format.buf = buf; | |
297 | format.bufbegin = buf; | |
298 | format.bufend = buf + sizeof buf; | |
299 | format.grow = fprint_flush; | |
300 | format.flushed = 0; | |
301 | format.u.n = fd; | |
302 | ||
303 | va_start(format.args, fmt); | |
304 | printfmt(&format, fmt); | |
305 | va_end(format.args); | |
306 | ||
307 | fprint_flush(&format, (size_t) 0); | |
308 | return format.flushed; | |
309 | } | |
310 | ||
311 | static void memprint_grow(Format *format, size_t more) { | |
312 | char *buf; | |
313 | size_t len = format->bufend - format->bufbegin + 1; | |
314 | len = (len >= more) | |
315 | ? len * 2 | |
316 | : ((len + more) + PRINT_ALLOCSIZE) &~ (PRINT_ALLOCSIZE - 1); | |
317 | if (format->u.n) | |
318 | buf = erealloc(format->bufbegin, len); | |
319 | else { | |
320 | size_t used = format->buf - format->bufbegin; | |
321 | buf = nalloc(len); | |
322 | memcpy(buf, format->bufbegin, used); | |
323 | } | |
324 | format->buf = buf + (format->buf - format->bufbegin); | |
325 | format->bufbegin = buf; | |
326 | format->bufend = buf + len - 1; | |
327 | } | |
328 | ||
329 | static char *memprint(Format *format, const char *fmt, char *buf, size_t len) { | |
330 | format->buf = buf; | |
331 | format->bufbegin = buf; | |
332 | format->bufend = buf + len - 1; | |
333 | format->grow = memprint_grow; | |
334 | format->flushed = 0; | |
335 | printfmt(format, fmt); | |
336 | *format->buf = '\0'; | |
337 | return format->bufbegin; | |
338 | } | |
339 | ||
340 | extern char *mprint(const char *fmt,...) { | |
341 | Format format; | |
342 | char *result; | |
343 | format.u.n = 1; | |
344 | va_start(format.args, fmt); | |
345 | result = memprint(&format, fmt, ealloc(PRINT_ALLOCSIZE), PRINT_ALLOCSIZE); | |
346 | va_end(format.args); | |
347 | return result; | |
348 | } | |
349 | ||
350 | extern char *nprint(const char *fmt,...) { | |
351 | Format format; | |
352 | char *result; | |
353 | format.u.n = 0; | |
354 | va_start(format.args, fmt); | |
355 | result = memprint(&format, fmt, nalloc(PRINT_ALLOCSIZE), PRINT_ALLOCSIZE); | |
356 | va_end(format.args); | |
357 | return result; | |
358 | } |