mirror of git://git.musl-libc.org/musl
implement wprintf family of functions
this implementation is extremely ugly and inefficient, but it avoids a good deal of code duplication and bloat. it may be cleaned up later to eliminate the remaining code duplication and some of the warts, but i don't really care about its performance. note that swprintf is not yet implemented.
This commit is contained in:
Rich Felker
parent
a012aa879f
commit
c35bb6645f
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@ -0,0 +1,13 @@
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#include <stdio.h>
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#include <stdarg.h>
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#include <wchar.h>
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int fwprintf(FILE *f, const wchar_t *fmt, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = vfwprintf(f, fmt, ap);
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va_end(ap);
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return ret;
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}
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@ -0,0 +1,354 @@
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#include "stdio_impl.h"
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/* Convenient bit representation for modifier flags, which all fall
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* within 31 codepoints of the space character. */
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#define ALT_FORM (1U<<'#'-' ')
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#define ZERO_PAD (1U<<'0'-' ')
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#define LEFT_ADJ (1U<<'-'-' ')
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#define PAD_POS (1U<<' '-' ')
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#define MARK_POS (1U<<'+'-' ')
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#define GROUPED (1U<<'\''-' ')
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#define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
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#if UINT_MAX == ULONG_MAX
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#define LONG_IS_INT
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#endif
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#if SIZE_MAX != ULONG_MAX || UINTMAX_MAX != ULLONG_MAX
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#define ODD_TYPES
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#endif
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/* State machine to accept length modifiers + conversion specifiers.
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* Result is 0 on failure, or an argument type to pop on success. */
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enum {
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BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
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ZTPRE, JPRE,
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STOP,
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PTR, INT, UINT, ULLONG,
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#ifndef LONG_IS_INT
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LONG, ULONG,
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#else
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#define LONG INT
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#define ULONG UINT
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#endif
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SHORT, USHORT, CHAR, UCHAR,
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#ifdef ODD_TYPES
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LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
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#else
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#define LLONG ULLONG
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#define SIZET ULONG
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#define IMAX LLONG
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#define UMAX ULLONG
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#define PDIFF LONG
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#define UIPTR ULONG
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#endif
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DBL, LDBL,
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NOARG,
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MAXSTATE
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};
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#define S(x) [(x)-'A']
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static const unsigned char states[]['z'-'A'+1] = {
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{ /* 0: bare types */
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S('d') = INT, S('i') = INT,
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S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
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S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
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S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
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S('c') = CHAR, S('C') = INT,
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S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
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S('m') = NOARG,
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S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
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S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
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}, { /* 1: l-prefixed */
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S('d') = LONG, S('i') = LONG,
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S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
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S('c') = INT, S('s') = PTR, S('n') = PTR,
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S('l') = LLPRE,
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}, { /* 2: ll-prefixed */
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S('d') = LLONG, S('i') = LLONG,
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S('o') = ULLONG, S('u') = ULLONG,
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S('x') = ULLONG, S('X') = ULLONG,
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S('n') = PTR,
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}, { /* 3: h-prefixed */
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S('d') = SHORT, S('i') = SHORT,
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S('o') = USHORT, S('u') = USHORT,
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S('x') = USHORT, S('X') = USHORT,
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S('n') = PTR,
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S('h') = HHPRE,
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}, { /* 4: hh-prefixed */
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S('d') = CHAR, S('i') = CHAR,
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S('o') = UCHAR, S('u') = UCHAR,
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S('x') = UCHAR, S('X') = UCHAR,
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S('n') = PTR,
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}, { /* 5: L-prefixed */
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S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
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S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
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S('n') = PTR,
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}, { /* 6: z- or t-prefixed (assumed to be same size) */
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S('d') = PDIFF, S('i') = PDIFF,
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S('o') = SIZET, S('u') = SIZET,
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S('x') = SIZET, S('X') = SIZET,
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S('n') = PTR,
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}, { /* 7: j-prefixed */
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S('d') = IMAX, S('i') = IMAX,
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S('o') = UMAX, S('u') = UMAX,
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S('x') = UMAX, S('X') = UMAX,
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S('n') = PTR,
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}
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};
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#define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
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union arg
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{
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uintmax_t i;
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long double f;
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void *p;
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};
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static void pop_arg(union arg *arg, int type, va_list *ap)
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{
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/* Give the compiler a hint for optimizing the switch. */
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if ((unsigned)type > MAXSTATE) return;
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switch (type) {
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case PTR: arg->p = va_arg(*ap, void *);
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break; case INT: arg->i = va_arg(*ap, int);
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break; case UINT: arg->i = va_arg(*ap, unsigned int);
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#ifndef LONG_IS_INT
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break; case LONG: arg->i = va_arg(*ap, long);
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break; case ULONG: arg->i = va_arg(*ap, unsigned long);
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#endif
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break; case ULLONG: arg->i = va_arg(*ap, unsigned long long);
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break; case SHORT: arg->i = (short)va_arg(*ap, int);
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break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int);
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break; case CHAR: arg->i = (signed char)va_arg(*ap, int);
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break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int);
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#ifdef ODD_TYPES
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break; case LLONG: arg->i = va_arg(*ap, long long);
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break; case SIZET: arg->i = va_arg(*ap, size_t);
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break; case IMAX: arg->i = va_arg(*ap, intmax_t);
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break; case UMAX: arg->i = va_arg(*ap, uintmax_t);
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break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t);
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break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *);
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#endif
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break; case DBL: arg->f = va_arg(*ap, double);
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break; case LDBL: arg->f = va_arg(*ap, long double);
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}
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}
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static void out(FILE *f, const wchar_t *s, size_t l)
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{
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while (l--) fputwc(*s++, f);
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}
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static int getint(wchar_t **s) {
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int i;
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for (i=0; iswdigit(**s); (*s)++)
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i = 10*i + (**s-'0');
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return i;
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}
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static const char sizeprefix['y'-'a'] = {
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['a'-'a']='L', ['e'-'a']='L', ['f'-'a']='L', ['g'-'a']='L',
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['d'-'a']='j', ['i'-'a']='j', ['o'-'a']='j', ['u'-'a']='j', ['x'-'a']='j',
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['p'-'a']='j'
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};
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static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
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{
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wchar_t *a, *z, *s=(wchar_t *)fmt, *s0;
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unsigned l10n=0, litpct, fl;
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int w, p;
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union arg arg;
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int argpos;
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unsigned st, ps;
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int cnt=0, l=0;
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int i;
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int t;
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char *bs;
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char charfmt[16];
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wchar_t wc;
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for (;;) {
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/* Update output count, end loop when fmt is exhausted */
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if (cnt >= 0) {
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if (l > INT_MAX - cnt) {
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if (!ferror(f)) errno = EOVERFLOW;
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cnt = -1;
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} else cnt += l;
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}
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if (!*s) break;
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/* Handle literal text and %% format specifiers */
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for (a=s; *s && *s!='%'; s++);
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litpct = wcsspn(s, L"%")/2; /* Optimize %%%% runs */
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z = s+litpct;
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s += 2*litpct;
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l = z-a;
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if (f) out(f, a, l);
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if (l) continue;
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if (iswdigit(s[1]) && s[2]=='$') {
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l10n=1;
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argpos = s[1]-'0';
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s+=3;
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} else {
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argpos = -1;
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s++;
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}
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/* Read modifier flags */
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for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
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fl |= 1U<<*s-' ';
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/* Read field width */
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if (*s=='*') {
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if (iswdigit(s[1]) && s[2]=='$') {
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l10n=1;
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nl_type[s[1]-'0'] = INT;
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w = nl_arg[s[1]-'0'].i;
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s+=3;
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} else if (!l10n) {
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w = f ? va_arg(*ap, int) : 0;
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s++;
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} else return -1;
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if (w<0) fl|=LEFT_ADJ, w=-w;
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} else if ((w=getint(&s))<0) return -1;
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/* Read precision */
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if (*s=='.' && s[1]=='*') {
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if (isdigit(s[2]) && s[3]=='$') {
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nl_type[s[2]-'0'] = INT;
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p = nl_arg[s[2]-'0'].i;
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s+=4;
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} else if (!l10n) {
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p = f ? va_arg(*ap, int) : 0;
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s+=2;
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} else return -1;
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} else if (*s=='.') {
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s++;
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p = getint(&s);
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} else p = -1;
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/* Format specifier state machine */
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s0=s;
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st=0;
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do {
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if (OOB(*s)) return -1;
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ps=st;
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st=states[st]S(*s++);
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} while (st-1<STOP);
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if (!st) return -1;
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/* Check validity of argument type (nl/normal) */
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if (st==NOARG) {
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if (argpos>=0) return -1;
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else if (!f) continue;
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} else {
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if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
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else if (f) pop_arg(&arg, st, ap);
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else return 0;
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}
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if (!f) continue;
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t = s[-1];
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if (ps && (t&15)==3) t&=~32;
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switch (t) {
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case 'n':
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switch(ps) {
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case BARE: *(int *)arg.p = cnt; break;
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case LPRE: *(long *)arg.p = cnt; break;
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case LLPRE: *(long long *)arg.p = cnt; break;
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case HPRE: *(unsigned short *)arg.p = cnt; break;
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case HHPRE: *(unsigned char *)arg.p = cnt; break;
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case ZTPRE: *(size_t *)arg.p = cnt; break;
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case JPRE: *(uintmax_t *)arg.p = cnt; break;
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}
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continue;
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case 'c':
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fputwc(btowc(arg.i), f);
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l = 1;
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continue;
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case 'C':
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fputwc(arg.i, f);
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l = 1;
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continue;
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case 'S':
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a = arg.p;
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z = wmemchr(a, 0, p);
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if (!z) z=a+p;
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else p=z-a;
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if (w<p) w=p;
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if (!(fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
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out(f, a, p);
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if ((fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
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l=w;
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continue;
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case 's':
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bs = arg.p;
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if (p<0) p = INT_MAX;
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for (l=0; l<p && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
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if (i<0) return -1;
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p=l;
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if (w<p) w=p;
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if (!(fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
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bs = arg.p;
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while (l--) {
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i=mbtowc(&wc, bs, MB_LEN_MAX);
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bs+=i;
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fputwc(wc, f);
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}
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if ((fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
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l=w;
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continue;
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}
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snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
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"#"+!(fl & ALT_FORM),
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"+"+!(fl & MARK_POS),
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"-"+!(fl & LEFT_ADJ),
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" "+!(fl & PAD_POS),
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"0"+!(fl & ZERO_PAD),
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sizeprefix[(t|32)-'a'], t);
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switch (t|32) {
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case 'a': case 'e': case 'f': case 'g':
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l = fprintf(f, charfmt, w, p, arg.f);
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break;
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case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
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l = fprintf(f, charfmt, w, p, arg.i);
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break;
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}
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}
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if (f) return cnt;
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if (!l10n) return 0;
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for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
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pop_arg(nl_arg+i, nl_type[i], ap);
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for (; i<=NL_ARGMAX && !nl_type[i]; i++);
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if (i<=NL_ARGMAX) return -1;
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return 1;
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}
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int vfwprintf(FILE *f, const wchar_t *fmt, va_list ap)
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{
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va_list ap2;
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int nl_type[NL_ARGMAX] = {0};
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union arg nl_arg[NL_ARGMAX];
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int ret;
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va_copy(ap2, ap);
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if (wprintf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) return -1;
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FLOCK(f);
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ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
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FUNLOCK(f);
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va_end(ap2);
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return ret;
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}
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@ -0,0 +1,7 @@
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#include <stdio.h>
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#include <wchar.h>
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int vwprintf(const wchar_t *fmt, va_list ap)
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{
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return vfwprintf(stdout, fmt, ap);
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}
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@ -0,0 +1,13 @@
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#include <stdio.h>
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#include <stdarg.h>
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#include <wchar.h>
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int wprintf(const wchar_t *fmt, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = vwprintf(fmt, ap);
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va_end(ap);
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return ret;
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}
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