1 #include "stdio_impl.h"
12 /* Convenient bit representation for modifier flags, which all fall
13 * within 31 codepoints of the space character. */
15 #define ALT_FORM (1U<<'#'-' ')
16 #define ZERO_PAD (1U<<'0'-' ')
17 #define LEFT_ADJ (1U<<'-'-' ')
18 #define PAD_POS (1U<<' '-' ')
19 #define MARK_POS (1U<<'+'-' ')
20 #define GROUPED (1U<<'\''-' ')
22 #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
24 /* State machine to accept length modifiers + conversion specifiers.
25 * Result is 0 on failure, or an argument type to pop on success. */
28 BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
31 PTR, INT, UINT, ULLONG,
33 SHORT, USHORT, CHAR, UCHAR,
34 LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
40 #define S(x) [(x)-'A']
42 static const unsigned char states[]['z'-'A'+1] = {
44 S('d') = INT, S('i') = INT,
45 S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
46 S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
47 S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
48 S('c') = CHAR, S('C') = INT,
49 S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
51 S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
52 S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
53 }, { /* 1: l-prefixed */
54 S('d') = LONG, S('i') = LONG,
55 S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
56 S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
57 S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
58 S('c') = INT, S('s') = PTR, S('n') = PTR,
60 }, { /* 2: ll-prefixed */
61 S('d') = LLONG, S('i') = LLONG,
62 S('o') = ULLONG, S('u') = ULLONG,
63 S('x') = ULLONG, S('X') = ULLONG,
65 }, { /* 3: h-prefixed */
66 S('d') = SHORT, S('i') = SHORT,
67 S('o') = USHORT, S('u') = USHORT,
68 S('x') = USHORT, S('X') = USHORT,
71 }, { /* 4: hh-prefixed */
72 S('d') = CHAR, S('i') = CHAR,
73 S('o') = UCHAR, S('u') = UCHAR,
74 S('x') = UCHAR, S('X') = UCHAR,
76 }, { /* 5: L-prefixed */
77 S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
78 S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
80 }, { /* 6: z- or t-prefixed (assumed to be same size) */
81 S('d') = PDIFF, S('i') = PDIFF,
82 S('o') = SIZET, S('u') = SIZET,
83 S('x') = SIZET, S('X') = SIZET,
85 }, { /* 7: j-prefixed */
86 S('d') = IMAX, S('i') = IMAX,
87 S('o') = UMAX, S('u') = UMAX,
88 S('x') = UMAX, S('X') = UMAX,
93 #define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
102 static void pop_arg(union arg *arg, int type, va_list *ap)
105 case PTR: arg->p = va_arg(*ap, void *);
106 break; case INT: arg->i = va_arg(*ap, int);
107 break; case UINT: arg->i = va_arg(*ap, unsigned int);
108 break; case LONG: arg->i = va_arg(*ap, long);
109 break; case ULONG: arg->i = va_arg(*ap, unsigned long);
110 break; case ULLONG: arg->i = va_arg(*ap, unsigned long long);
111 break; case SHORT: arg->i = (short)va_arg(*ap, int);
112 break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int);
113 break; case CHAR: arg->i = (signed char)va_arg(*ap, int);
114 break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int);
115 break; case LLONG: arg->i = va_arg(*ap, long long);
116 break; case SIZET: arg->i = va_arg(*ap, size_t);
117 break; case IMAX: arg->i = va_arg(*ap, intmax_t);
118 break; case UMAX: arg->i = va_arg(*ap, uintmax_t);
119 break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t);
120 break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *);
121 break; case DBL: arg->f = va_arg(*ap, double);
122 break; case LDBL: arg->f = va_arg(*ap, long double);
126 static void out(FILE *f, const wchar_t *s, size_t l)
128 while (l-- && !ferror(f)) fputwc(*s++, f);
131 static void pad(FILE *f, int n, int fl)
133 if ((fl & LEFT_ADJ) || !n || ferror(f)) return;
134 fprintf(f, "%*s", n, "");
137 static int getint(wchar_t **s) {
139 for (i=0; iswdigit(**s); (*s)++) {
140 if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1;
141 else i = 10*i + (**s-'0');
146 static const char sizeprefix['y'-'a'] = {
147 ['a'-'a']='L', ['e'-'a']='L', ['f'-'a']='L', ['g'-'a']='L',
148 ['d'-'a']='j', ['i'-'a']='j', ['o'-'a']='j', ['u'-'a']='j', ['x'-'a']='j',
152 static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
154 wchar_t *a, *z, *s=(wchar_t *)fmt;
168 /* This error is only specified for snprintf, but since it's
169 * unspecified for other forms, do the same. Stop immediately
170 * on overflow; otherwise %n could produce wrong results. */
171 if (l > INT_MAX - cnt) goto overflow;
173 /* Update output count, end loop when fmt is exhausted */
177 /* Handle literal text and %% format specifiers */
178 for (a=s; *s && *s!='%'; s++);
179 for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2);
180 if (z-a > INT_MAX-cnt) goto overflow;
185 if (iswdigit(s[1]) && s[2]=='$') {
194 /* Read modifier flags */
195 for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
198 /* Read field width */
200 if (iswdigit(s[1]) && s[2]=='$') {
202 nl_type[s[1]-'0'] = INT;
203 w = nl_arg[s[1]-'0'].i;
206 w = f ? va_arg(*ap, int) : 0;
209 if (w<0) fl|=LEFT_ADJ, w=-w;
210 } else if ((w=getint(&s))<0) goto overflow;
213 if (*s=='.' && s[1]=='*') {
214 if (isdigit(s[2]) && s[3]=='$') {
215 nl_type[s[2]-'0'] = INT;
216 p = nl_arg[s[2]-'0'].i;
219 p = f ? va_arg(*ap, int) : 0;
223 } else if (*s=='.') {
232 /* Format specifier state machine */
235 if (OOB(*s)) goto inval;
237 st=states[st]S(*s++);
241 /* Check validity of argument type (nl/normal) */
243 if (argpos>=0) goto inval;
245 if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
246 else if (f) pop_arg(&arg, st, ap);
252 /* Do not process any new directives once in error state. */
253 if (ferror(f)) return -1;
256 if (ps && (t&15)==3) t&=~32;
261 case BARE: *(int *)arg.p = cnt; break;
262 case LPRE: *(long *)arg.p = cnt; break;
263 case LLPRE: *(long long *)arg.p = cnt; break;
264 case HPRE: *(unsigned short *)arg.p = cnt; break;
265 case HHPRE: *(unsigned char *)arg.p = cnt; break;
266 case ZTPRE: *(size_t *)arg.p = cnt; break;
267 case JPRE: *(uintmax_t *)arg.p = cnt; break;
274 out(f, &(wchar_t){t=='C' ? arg.i : btowc(arg.i)}, 1);
275 pad(f, w-1, fl^LEFT_ADJ);
280 z = a + wcsnlen(a, p<0 ? INT_MAX : p);
281 if (p<0 && *z) goto overflow;
286 pad(f, w-p, fl^LEFT_ADJ);
290 arg.p = strerror(errno);
292 if (!arg.p) arg.p = "(null)";
294 for (i=l=0; l<(p<0?INT_MAX:p) && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
296 if (p<0 && *bs) goto overflow;
302 i=mbtowc(&wc, bs, MB_LEN_MAX);
306 pad(f, w-p, fl^LEFT_ADJ);
311 if (xp && p<0) goto overflow;
312 snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
313 "#"+!(fl & ALT_FORM),
314 "+"+!(fl & MARK_POS),
315 "-"+!(fl & LEFT_ADJ),
317 "0"+!(fl & ZERO_PAD),
318 sizeprefix[(t|32)-'a'], t);
321 case 'a': case 'e': case 'f': case 'g':
322 l = fprintf(f, charfmt, w, p, arg.f);
324 case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
325 l = fprintf(f, charfmt, w, p, arg.i);
333 for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
334 pop_arg(nl_arg+i, nl_type[i], ap);
335 for (; i<=NL_ARGMAX && !nl_type[i]; i++);
336 if (i<=NL_ARGMAX) return -1;
347 int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
350 int nl_type[NL_ARGMAX] = {0};
351 union arg nl_arg[NL_ARGMAX];
355 /* the copy allows passing va_list* even if va_list is an array */
357 if (wprintf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
364 olderr = f->flags & F_ERR;
366 ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
367 if (ferror(f)) ret = -1;