1 85231fd8 2006-05-21 devnull /* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
  2 91c13e54 2004-02-29 devnull #include <stdarg.h>
  3 91c13e54 2004-02-29 devnull #include <string.h>
  4 e5aa96ac 2004-12-26 devnull #include "plan9.h"
  5 91c13e54 2004-02-29 devnull #include "fmt.h"
  6 91c13e54 2004-02-29 devnull #include "fmtdef.h"
  7 91c13e54 2004-02-29 devnull 
  8 91c13e54 2004-02-29 devnull enum
  9 91c13e54 2004-02-29 devnull {
 10 91c13e54 2004-02-29 devnull 	Maxfmt = 64
 11 91c13e54 2004-02-29 devnull };
 12 91c13e54 2004-02-29 devnull 
 13 91c13e54 2004-02-29 devnull typedef struct Convfmt Convfmt;
 14 91c13e54 2004-02-29 devnull struct Convfmt
 15 91c13e54 2004-02-29 devnull {
 16 91c13e54 2004-02-29 devnull 	int	c;
 17 91c13e54 2004-02-29 devnull 	volatile	Fmts	fmt;	/* for spin lock in fmtfmt; avoids race due to write order */
 18 91c13e54 2004-02-29 devnull };
 19 91c13e54 2004-02-29 devnull 
 20 85231fd8 2006-05-21 devnull static struct
 21 91c13e54 2004-02-29 devnull {
 22 91c13e54 2004-02-29 devnull 	/* lock by calling __fmtlock, __fmtunlock */
 23 91c13e54 2004-02-29 devnull 	int	nfmt;
 24 91c13e54 2004-02-29 devnull 	Convfmt	fmt[Maxfmt];
 25 91c13e54 2004-02-29 devnull } fmtalloc;
 26 91c13e54 2004-02-29 devnull 
 27 91c13e54 2004-02-29 devnull static Convfmt knownfmt[] = {
 28 91c13e54 2004-02-29 devnull 	' ',	__flagfmt,
 29 91c13e54 2004-02-29 devnull 	'#',	__flagfmt,
 30 91c13e54 2004-02-29 devnull 	'%',	__percentfmt,
 31 85231fd8 2006-05-21 devnull 	'\'',	__flagfmt,
 32 91c13e54 2004-02-29 devnull 	'+',	__flagfmt,
 33 91c13e54 2004-02-29 devnull 	',',	__flagfmt,
 34 91c13e54 2004-02-29 devnull 	'-',	__flagfmt,
 35 91c13e54 2004-02-29 devnull 	'C',	__runefmt,	/* Plan 9 addition */
 36 91c13e54 2004-02-29 devnull 	'E',	__efgfmt,
 37 df121a00 2004-12-26 devnull #ifndef PLAN9PORT
 38 91c13e54 2004-02-29 devnull 	'F',	__efgfmt,	/* ANSI only */
 39 df121a00 2004-12-26 devnull #endif
 40 91c13e54 2004-02-29 devnull 	'G',	__efgfmt,
 41 df121a00 2004-12-26 devnull #ifndef PLAN9PORT
 42 91c13e54 2004-02-29 devnull 	'L',	__flagfmt,	/* ANSI only */
 43 df121a00 2004-12-26 devnull #endif
 44 91c13e54 2004-02-29 devnull 	'S',	__runesfmt,	/* Plan 9 addition */
 45 91c13e54 2004-02-29 devnull 	'X',	__ifmt,
 46 91c13e54 2004-02-29 devnull 	'b',	__ifmt,		/* Plan 9 addition */
 47 91c13e54 2004-02-29 devnull 	'c',	__charfmt,
 48 91c13e54 2004-02-29 devnull 	'd',	__ifmt,
 49 91c13e54 2004-02-29 devnull 	'e',	__efgfmt,
 50 91c13e54 2004-02-29 devnull 	'f',	__efgfmt,
 51 91c13e54 2004-02-29 devnull 	'g',	__efgfmt,
 52 91c13e54 2004-02-29 devnull 	'h',	__flagfmt,
 53 df121a00 2004-12-26 devnull #ifndef PLAN9PORT
 54 91c13e54 2004-02-29 devnull 	'i',	__ifmt,		/* ANSI only */
 55 df121a00 2004-12-26 devnull #endif
 56 91c13e54 2004-02-29 devnull 	'l',	__flagfmt,
 57 91c13e54 2004-02-29 devnull 	'n',	__countfmt,
 58 91c13e54 2004-02-29 devnull 	'o',	__ifmt,
 59 91c13e54 2004-02-29 devnull 	'p',	__ifmt,
 60 91c13e54 2004-02-29 devnull 	'r',	__errfmt,
 61 91c13e54 2004-02-29 devnull 	's',	__strfmt,
 62 e5aa96ac 2004-12-26 devnull #ifdef PLAN9PORT
 63 e5aa96ac 2004-12-26 devnull 	'u',	__flagfmt,
 64 e5aa96ac 2004-12-26 devnull #else
 65 e5aa96ac 2004-12-26 devnull 	'u',	__ifmt,
 66 e5aa96ac 2004-12-26 devnull #endif
 67 91c13e54 2004-02-29 devnull 	'x',	__ifmt,
 68 91c13e54 2004-02-29 devnull 	0,	nil,
 69 91c13e54 2004-02-29 devnull };
 70 91c13e54 2004-02-29 devnull 
 71 91c13e54 2004-02-29 devnull 
 72 91c13e54 2004-02-29 devnull int	(*fmtdoquote)(int);
 73 91c13e54 2004-02-29 devnull 
 74 91c13e54 2004-02-29 devnull /*
 75 91c13e54 2004-02-29 devnull  * __fmtlock() must be set
 76 91c13e54 2004-02-29 devnull  */
 77 91c13e54 2004-02-29 devnull static int
 78 91c13e54 2004-02-29 devnull __fmtinstall(int c, Fmts f)
 79 91c13e54 2004-02-29 devnull {
 80 91c13e54 2004-02-29 devnull 	Convfmt *p, *ep;
 81 91c13e54 2004-02-29 devnull 
 82 91c13e54 2004-02-29 devnull 	if(c<=0 || c>=65536)
 83 91c13e54 2004-02-29 devnull 		return -1;
 84 91c13e54 2004-02-29 devnull 	if(!f)
 85 91c13e54 2004-02-29 devnull 		f = __badfmt;
 86 91c13e54 2004-02-29 devnull 
 87 91c13e54 2004-02-29 devnull 	ep = &fmtalloc.fmt[fmtalloc.nfmt];
 88 91c13e54 2004-02-29 devnull 	for(p=fmtalloc.fmt; p<ep; p++)
 89 91c13e54 2004-02-29 devnull 		if(p->c == c)
 90 91c13e54 2004-02-29 devnull 			break;
 91 91c13e54 2004-02-29 devnull 
 92 91c13e54 2004-02-29 devnull 	if(p == &fmtalloc.fmt[Maxfmt])
 93 91c13e54 2004-02-29 devnull 		return -1;
 94 91c13e54 2004-02-29 devnull 
 95 91c13e54 2004-02-29 devnull 	p->fmt = f;
 96 91c13e54 2004-02-29 devnull 	if(p == ep){	/* installing a new format character */
 97 91c13e54 2004-02-29 devnull 		fmtalloc.nfmt++;
 98 91c13e54 2004-02-29 devnull 		p->c = c;
 99 91c13e54 2004-02-29 devnull 	}
100 91c13e54 2004-02-29 devnull 
101 91c13e54 2004-02-29 devnull 	return 0;
102 91c13e54 2004-02-29 devnull }
103 91c13e54 2004-02-29 devnull 
104 91c13e54 2004-02-29 devnull int
105 e5aa96ac 2004-12-26 devnull fmtinstall(int c, int (*f)(Fmt*))
106 91c13e54 2004-02-29 devnull {
107 91c13e54 2004-02-29 devnull 	int ret;
108 91c13e54 2004-02-29 devnull 
109 91c13e54 2004-02-29 devnull 	__fmtlock();
110 91c13e54 2004-02-29 devnull 	ret = __fmtinstall(c, f);
111 91c13e54 2004-02-29 devnull 	__fmtunlock();
112 91c13e54 2004-02-29 devnull 	return ret;
113 91c13e54 2004-02-29 devnull }
114 91c13e54 2004-02-29 devnull 
115 91c13e54 2004-02-29 devnull static Fmts
116 91c13e54 2004-02-29 devnull fmtfmt(int c)
117 91c13e54 2004-02-29 devnull {
118 91c13e54 2004-02-29 devnull 	Convfmt *p, *ep;
119 91c13e54 2004-02-29 devnull 
120 91c13e54 2004-02-29 devnull 	ep = &fmtalloc.fmt[fmtalloc.nfmt];
121 91c13e54 2004-02-29 devnull 	for(p=fmtalloc.fmt; p<ep; p++)
122 91c13e54 2004-02-29 devnull 		if(p->c == c){
123 91c13e54 2004-02-29 devnull 			while(p->fmt == nil)	/* loop until value is updated */
124 91c13e54 2004-02-29 devnull 				;
125 91c13e54 2004-02-29 devnull 			return p->fmt;
126 91c13e54 2004-02-29 devnull 		}
127 91c13e54 2004-02-29 devnull 
128 91c13e54 2004-02-29 devnull 	/* is this a predefined format char? */
129 91c13e54 2004-02-29 devnull 	__fmtlock();
130 91c13e54 2004-02-29 devnull 	for(p=knownfmt; p->c; p++)
131 91c13e54 2004-02-29 devnull 		if(p->c == c){
132 91c13e54 2004-02-29 devnull 			__fmtinstall(p->c, p->fmt);
133 91c13e54 2004-02-29 devnull 			__fmtunlock();
134 91c13e54 2004-02-29 devnull 			return p->fmt;
135 91c13e54 2004-02-29 devnull 		}
136 91c13e54 2004-02-29 devnull 	__fmtunlock();
137 91c13e54 2004-02-29 devnull 
138 91c13e54 2004-02-29 devnull 	return __badfmt;
139 91c13e54 2004-02-29 devnull }
140 91c13e54 2004-02-29 devnull 
141 91c13e54 2004-02-29 devnull void*
142 91c13e54 2004-02-29 devnull __fmtdispatch(Fmt *f, void *fmt, int isrunes)
143 91c13e54 2004-02-29 devnull {
144 91c13e54 2004-02-29 devnull 	Rune rune, r;
145 91c13e54 2004-02-29 devnull 	int i, n;
146 91c13e54 2004-02-29 devnull 
147 91c13e54 2004-02-29 devnull 	f->flags = 0;
148 91c13e54 2004-02-29 devnull 	f->width = f->prec = 0;
149 91c13e54 2004-02-29 devnull 
150 91c13e54 2004-02-29 devnull 	for(;;){
151 91c13e54 2004-02-29 devnull 		if(isrunes){
152 91c13e54 2004-02-29 devnull 			r = *(Rune*)fmt;
153 91c13e54 2004-02-29 devnull 			fmt = (Rune*)fmt + 1;
154 91c13e54 2004-02-29 devnull 		}else{
155 91c13e54 2004-02-29 devnull 			fmt = (char*)fmt + chartorune(&rune, (char*)fmt);
156 91c13e54 2004-02-29 devnull 			r = rune;
157 91c13e54 2004-02-29 devnull 		}
158 91c13e54 2004-02-29 devnull 		f->r = r;
159 91c13e54 2004-02-29 devnull 		switch(r){
160 91c13e54 2004-02-29 devnull 		case '\0':
161 91c13e54 2004-02-29 devnull 			return nil;
162 91c13e54 2004-02-29 devnull 		case '.':
163 91c13e54 2004-02-29 devnull 			f->flags |= FmtWidth|FmtPrec;
164 91c13e54 2004-02-29 devnull 			continue;
165 91c13e54 2004-02-29 devnull 		case '0':
166 91c13e54 2004-02-29 devnull 			if(!(f->flags & FmtWidth)){
167 91c13e54 2004-02-29 devnull 				f->flags |= FmtZero;
168 91c13e54 2004-02-29 devnull 				continue;
169 91c13e54 2004-02-29 devnull 			}
170 91c13e54 2004-02-29 devnull 			/* fall through */
171 91c13e54 2004-02-29 devnull 		case '1': case '2': case '3': case '4':
172 91c13e54 2004-02-29 devnull 		case '5': case '6': case '7': case '8': case '9':
173 91c13e54 2004-02-29 devnull 			i = 0;
174 91c13e54 2004-02-29 devnull 			while(r >= '0' && r <= '9'){
175 91c13e54 2004-02-29 devnull 				i = i * 10 + r - '0';
176 91c13e54 2004-02-29 devnull 				if(isrunes){
177 91c13e54 2004-02-29 devnull 					r = *(Rune*)fmt;
178 91c13e54 2004-02-29 devnull 					fmt = (Rune*)fmt + 1;
179 91c13e54 2004-02-29 devnull 				}else{
180 91c13e54 2004-02-29 devnull 					r = *(char*)fmt;
181 91c13e54 2004-02-29 devnull 					fmt = (char*)fmt + 1;
182 91c13e54 2004-02-29 devnull 				}
183 91c13e54 2004-02-29 devnull 			}
184 91c13e54 2004-02-29 devnull 			if(isrunes)
185 91c13e54 2004-02-29 devnull 				fmt = (Rune*)fmt - 1;
186 91c13e54 2004-02-29 devnull 			else
187 91c13e54 2004-02-29 devnull 				fmt = (char*)fmt - 1;
188 91c13e54 2004-02-29 devnull 		numflag:
189 91c13e54 2004-02-29 devnull 			if(f->flags & FmtWidth){
190 91c13e54 2004-02-29 devnull 				f->flags |= FmtPrec;
191 91c13e54 2004-02-29 devnull 				f->prec = i;
192 91c13e54 2004-02-29 devnull 			}else{
193 91c13e54 2004-02-29 devnull 				f->flags |= FmtWidth;
194 91c13e54 2004-02-29 devnull 				f->width = i;
195 91c13e54 2004-02-29 devnull 			}
196 91c13e54 2004-02-29 devnull 			continue;
197 91c13e54 2004-02-29 devnull 		case '*':
198 91c13e54 2004-02-29 devnull 			i = va_arg(f->args, int);
199 91c13e54 2004-02-29 devnull 			if(i < 0){
200 91c13e54 2004-02-29 devnull 				/*
201 91c13e54 2004-02-29 devnull 				 * negative precision =>
202 91c13e54 2004-02-29 devnull 				 * ignore the precision.
203 91c13e54 2004-02-29 devnull 				 */
204 91c13e54 2004-02-29 devnull 				if(f->flags & FmtPrec){
205 91c13e54 2004-02-29 devnull 					f->flags &= ~FmtPrec;
206 91c13e54 2004-02-29 devnull 					f->prec = 0;
207 91c13e54 2004-02-29 devnull 					continue;
208 91c13e54 2004-02-29 devnull 				}
209 91c13e54 2004-02-29 devnull 				i = -i;
210 91c13e54 2004-02-29 devnull 				f->flags |= FmtLeft;
211 91c13e54 2004-02-29 devnull 			}
212 91c13e54 2004-02-29 devnull 			goto numflag;
213 91c13e54 2004-02-29 devnull 		}
214 91c13e54 2004-02-29 devnull 		n = (*fmtfmt(r))(f);
215 91c13e54 2004-02-29 devnull 		if(n < 0)
216 91c13e54 2004-02-29 devnull 			return nil;
217 91c13e54 2004-02-29 devnull 		if(n == 0)
218 91c13e54 2004-02-29 devnull 			return fmt;
219 91c13e54 2004-02-29 devnull 	}
220 91c13e54 2004-02-29 devnull }