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src/stdio/vfwprintf.c
372 строки
9 KB
Rich Felker
all printf variants: fix argument type handling for %c and %lc
13 июн 2023, 02:56
13 июн 2023, 02:56
3a23cd0
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#include "stdio_impl.h" #include <errno.h> #include <ctype.h> #include <limits.h> #include <string.h> #include <stdarg.h> #include <stddef.h> #include <stdlib.h> #include <wchar.h> #include <inttypes.h> /* Convenient bit representation for modifier flags, which all fall * within 31 codepoints of the space character. */ #define ALT_FORM (1U<<'#'-' ') #define ZERO_PAD (1U<<'0'-' ') #define LEFT_ADJ (1U<<'-'-' ') #define PAD_POS (1U<<' '-' ') #define MARK_POS (1U<<'+'-' ') #define GROUPED (1U<<'\''-' ') #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED) /* State machine to accept length modifiers + conversion specifiers. * Result is 0 on failure, or an argument type to pop on success. */ enum { BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE, ZTPRE, JPRE, STOP, PTR, INT, UINT, ULLONG, LONG, ULONG, SHORT, USHORT, CHAR, UCHAR, LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR, DBL, LDBL, NOARG, MAXSTATE }; #define S(x) [(x)-'A'] static const unsigned char states[]['z'-'A'+1] = { { /* 0: bare types */ S('d') = INT, S('i') = INT, S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT, S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL, S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL, S('c') = INT, S('C') = UINT, S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR, S('m') = NOARG, S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE, S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE, }, { /* 1: l-prefixed */ S('d') = LONG, S('i') = LONG, S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG, S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL, S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL, S('c') = UINT, S('s') = PTR, S('n') = PTR, S('l') = LLPRE, }, { /* 2: ll-prefixed */ S('d') = LLONG, S('i') = LLONG, S('o') = ULLONG, S('u') = ULLONG, S('x') = ULLONG, S('X') = ULLONG, S('n') = PTR, }, { /* 3: h-prefixed */ S('d') = SHORT, S('i') = SHORT, S('o') = USHORT, S('u') = USHORT, S('x') = USHORT, S('X') = USHORT, S('n') = PTR, S('h') = HHPRE, }, { /* 4: hh-prefixed */ S('d') = CHAR, S('i') = CHAR, S('o') = UCHAR, S('u') = UCHAR, S('x') = UCHAR, S('X') = UCHAR, S('n') = PTR, }, { /* 5: L-prefixed */ S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL, S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL, S('n') = PTR, }, { /* 6: z- or t-prefixed (assumed to be same size) */ S('d') = PDIFF, S('i') = PDIFF, S('o') = SIZET, S('u') = SIZET, S('x') = SIZET, S('X') = SIZET, S('n') = PTR, }, { /* 7: j-prefixed */ S('d') = IMAX, S('i') = IMAX, S('o') = UMAX, S('u') = UMAX, S('x') = UMAX, S('X') = UMAX, S('n') = PTR, } }; #define OOB(x) ((unsigned)(x)-'A' > 'z'-'A') union arg { uintmax_t i; long double f; void *p; }; static void pop_arg(union arg *arg, int type, va_list *ap) { switch (type) { case PTR: arg->p = va_arg(*ap, void *); break; case INT: arg->i = va_arg(*ap, int); break; case UINT: arg->i = va_arg(*ap, unsigned int); break; case LONG: arg->i = va_arg(*ap, long); break; case ULONG: arg->i = va_arg(*ap, unsigned long); break; case ULLONG: arg->i = va_arg(*ap, unsigned long long); break; case SHORT: arg->i = (short)va_arg(*ap, int); break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int); break; case CHAR: arg->i = (signed char)va_arg(*ap, int); break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int); break; case LLONG: arg->i = va_arg(*ap, long long); break; case SIZET: arg->i = va_arg(*ap, size_t); break; case IMAX: arg->i = va_arg(*ap, intmax_t); break; case UMAX: arg->i = va_arg(*ap, uintmax_t); break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t); break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *); break; case DBL: arg->f = va_arg(*ap, double); break; case LDBL: arg->f = va_arg(*ap, long double); } } static void out(FILE *f, const wchar_t *s, size_t l) { while (l-- && !ferror(f)) fputwc(*s++, f); } static void pad(FILE *f, int n, int fl) { if ((fl & LEFT_ADJ) || !n || ferror(f)) return; fprintf(f, "%*s", n, ""); } static int getint(wchar_t **s) { int i; for (i=0; iswdigit(**s); (*s)++) { if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1; else i = 10*i + (**s-'0'); } return i; } static const char sizeprefix['y'-'a'] = { ['a'-'a']='L', ['e'-'a']='L', ['f'-'a']='L', ['g'-'a']='L', ['d'-'a']='j', ['i'-'a']='j', ['o'-'a']='j', ['u'-'a']='j', ['x'-'a']='j', ['p'-'a']='j' }; static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_arg, int *nl_type) { wchar_t *a, *z, *s=(wchar_t *)fmt; unsigned l10n=0, fl; int w, p, xp; union arg arg; int argpos; unsigned st, ps; int cnt=0, l=0; int i; int t; char *bs; char charfmt[16]; wchar_t wc; for (;;) { /* This error is only specified for snprintf, but since it's * unspecified for other forms, do the same. Stop immediately * on overflow; otherwise %n could produce wrong results. */ if (l > INT_MAX - cnt) goto overflow; /* Update output count, end loop when fmt is exhausted */ cnt += l; if (!*s) break; /* Handle literal text and %% format specifiers */ for (a=s; *s && *s!='%'; s++); for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2); if (z-a > INT_MAX-cnt) goto overflow; l = z-a; if (f) out(f, a, l); if (l) continue; if (iswdigit(s[1]) && s[2]=='$') { l10n=1; argpos = s[1]-'0'; s+=3; } else { argpos = -1; s++; } /* Read modifier flags */ for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++) fl |= 1U<<*s-' '; /* Read field width */ if (*s=='*') { if (iswdigit(s[1]) && s[2]=='$') { l10n=1; nl_type[s[1]-'0'] = INT; w = nl_arg[s[1]-'0'].i; s+=3; } else if (!l10n) { w = f ? va_arg(*ap, int) : 0; s++; } else goto inval; if (w<0) fl|=LEFT_ADJ, w=-w; } else if ((w=getint(&s))<0) goto overflow; /* Read precision */ if (*s=='.' && s[1]=='*') { if (isdigit(s[2]) && s[3]=='$') { nl_type[s[2]-'0'] = INT; p = nl_arg[s[2]-'0'].i; s+=4; } else if (!l10n) { p = f ? va_arg(*ap, int) : 0; s+=2; } else goto inval; xp = (p>=0); } else if (*s=='.') { s++; p = getint(&s); xp = 1; } else { p = -1; xp = 0; } /* Format specifier state machine */ st=0; do { if (OOB(*s)) goto inval; ps=st; st=states[st]S(*s++); } while (st-1<STOP); if (!st) goto inval; /* Check validity of argument type (nl/normal) */ if (st==NOARG) { if (argpos>=0) goto inval; } else { if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos]; else if (f) pop_arg(&arg, st, ap); else return 0; } if (!f) continue; /* Do not process any new directives once in error state. */ if (ferror(f)) return -1; t = s[-1]; if (ps && (t&15)==3) t&=~32; switch (t) { case 'n': switch(ps) { case BARE: *(int *)arg.p = cnt; break; case LPRE: *(long *)arg.p = cnt; break; case LLPRE: *(long long *)arg.p = cnt; break; case HPRE: *(unsigned short *)arg.p = cnt; break; case HHPRE: *(unsigned char *)arg.p = cnt; break; case ZTPRE: *(size_t *)arg.p = cnt; break; case JPRE: *(uintmax_t *)arg.p = cnt; break; } continue; case 'c': case 'C': if (w<1) w=1; pad(f, w-1, fl); out(f, &(wchar_t){t=='C' ? arg.i : btowc(arg.i)}, 1); pad(f, w-1, fl^LEFT_ADJ); l = w; continue; case 'S': a = arg.p; z = a + wcsnlen(a, p<0 ? INT_MAX : p); if (p<0 && *z) goto overflow; p = z-a; if (w<p) w=p; pad(f, w-p, fl); out(f, a, p); pad(f, w-p, fl^LEFT_ADJ); l=w; continue; case 'm': arg.p = strerror(errno); case 's': if (!arg.p) arg.p = "(null)"; bs = arg.p; for (i=l=0; l<(p<0?INT_MAX:p) && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++); if (i<0) return -1; if (p<0 && *bs) goto overflow; p=l; if (w<p) w=p; pad(f, w-p, fl); bs = arg.p; while (l--) { i=mbtowc(&wc, bs, MB_LEN_MAX); bs+=i; out(f, &wc, 1); } pad(f, w-p, fl^LEFT_ADJ); l=w; continue; } if (xp && p<0) goto overflow; snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c", "#"+!(fl & ALT_FORM), "+"+!(fl & MARK_POS), "-"+!(fl & LEFT_ADJ), " "+!(fl & PAD_POS), "0"+!(fl & ZERO_PAD), sizeprefix[(t|32)-'a'], t); switch (t|32) { case 'a': case 'e': case 'f': case 'g': l = fprintf(f, charfmt, w, p, arg.f); break; case 'd': case 'i': case 'o': case 'u': case 'x': case 'p': l = fprintf(f, charfmt, w, p, arg.i); break; } } if (f) return cnt; if (!l10n) return 0; for (i=1; i<=NL_ARGMAX && nl_type[i]; i++) pop_arg(nl_arg+i, nl_type[i], ap); for (; i<=NL_ARGMAX && !nl_type[i]; i++); if (i<=NL_ARGMAX) return -1; return 1; inval: errno = EINVAL; return -1; overflow: errno = EOVERFLOW; return -1; } int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap) { va_list ap2; int nl_type[NL_ARGMAX+1] = {0}; union arg nl_arg[NL_ARGMAX+1]; int olderr; int ret; /* the copy allows passing va_list* even if va_list is an array */ va_copy(ap2, ap); if (wprintf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) { va_end(ap2); return -1; } FLOCK(f); fwide(f, 1); olderr = f->flags & F_ERR; f->flags &= ~F_ERR; ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type); if (ferror(f)) ret = -1; f->flags |= olderr; FUNLOCK(f); va_end(ap2); return ret; }