Move shared parts of the two printfs out.
Bug: http://b/67371539
Test: ran tests
Change-Id: I24eae6a5d2c64ff4fd65c8d508a3709bab5a11c4
diff --git a/libc/stdio/printf_common.h b/libc/stdio/printf_common.h
new file mode 100644
index 0000000..13b4246
--- /dev/null
+++ b/libc/stdio/printf_common.h
@@ -0,0 +1,683 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <errno.h>
+#include <float.h>
+#include <langinfo.h>
+#include <limits.h>
+#include <locale.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wchar.h>
+
+#include "fvwrite.h"
+#include "gdtoa.h"
+#include "local.h"
+
+union arg {
+ int intarg;
+ unsigned int uintarg;
+ long longarg;
+ unsigned long ulongarg;
+ long long longlongarg;
+ unsigned long long ulonglongarg;
+ ptrdiff_t ptrdiffarg;
+ size_t sizearg;
+ ssize_t ssizearg;
+ intmax_t intmaxarg;
+ uintmax_t uintmaxarg;
+ void* pvoidarg;
+ char* pchararg;
+ signed char* pschararg;
+ short* pshortarg;
+ int* pintarg;
+ long* plongarg;
+ long long* plonglongarg;
+ ptrdiff_t* pptrdiffarg;
+ ssize_t* pssizearg;
+ intmax_t* pintmaxarg;
+ double doublearg;
+ long double longdoublearg;
+ wint_t wintarg;
+ wchar_t* pwchararg;
+};
+
+// Helper function for `fprintf to unbuffered unix file': creates a
+// temporary buffer. We only work on write-only files; this avoids
+// worries about ungetc buffers and so forth.
+static int __sbprintf(FILE* fp, const CHAR_TYPE* fmt, va_list ap) {
+ FILE fake;
+ struct __sfileext fakeext;
+ unsigned char buf[BUFSIZ];
+
+ _FILEEXT_SETUP(&fake, &fakeext);
+ /* copy the important variables */
+ fake._flags = fp->_flags & ~__SNBF;
+ fake._file = fp->_file;
+ fake._cookie = fp->_cookie;
+ fake._write = fp->_write;
+
+ /* set up the buffer */
+ fake._bf._base = fake._p = buf;
+ fake._bf._size = fake._w = sizeof(buf);
+ fake._lbfsize = 0; /* not actually used, but Just In Case */
+
+ /* do the work, then copy any error status */
+ int ret = FUNCTION_NAME(&fake, fmt, ap);
+ if (ret >= 0 && __sflush(&fake)) ret = EOF;
+ if (fake._flags & __SERR) fp->_flags |= __SERR;
+ return ret;
+}
+
+static int __find_arguments(const CHAR_TYPE* fmt0, va_list ap, union arg** argtable, size_t* argtablesiz);
+static int __grow_type_table(unsigned char** typetable, int* tablesize);
+
+#define DEFPREC 6
+
+#define to_digit(c) ((c) - '0')
+#define is_digit(c) ((unsigned)to_digit(c) <= 9)
+#define to_char(n) ((CHAR_TYPE)((n) + '0'))
+
+template <typename CharT>
+static int exponent(CharT* p0, int exp, int fmtch) {
+ CharT* p = p0;
+ *p++ = fmtch;
+ if (exp < 0) {
+ exp = -exp;
+ *p++ = '-';
+ } else {
+ *p++ = '+';
+ }
+
+ CharT expbuf[MAXEXPDIG];
+ CharT* t = expbuf + MAXEXPDIG;
+ if (exp > 9) {
+ do {
+ *--t = to_char(exp % 10);
+ } while ((exp /= 10) > 9);
+ *--t = to_char(exp);
+ for (; t < expbuf + MAXEXPDIG; *p++ = *t++) /* nothing */;
+ } else {
+ /*
+ * Exponents for decimal floating point conversions
+ * (%[eEgG]) must be at least two characters long,
+ * whereas exponents for hexadecimal conversions can
+ * be only one character long.
+ */
+ if (fmtch == 'e' || fmtch == 'E') *p++ = '0';
+ *p++ = to_char(exp);
+ }
+ return (p - p0);
+}
+
+#define PAD(howmany, with) \
+ do { \
+ if ((n = (howmany)) > 0) { \
+ while (n > PADSIZE) { \
+ PRINT(with, PADSIZE); \
+ n -= PADSIZE; \
+ } \
+ PRINT(with, n); \
+ } \
+ } while (0)
+
+#define PRINTANDPAD(p, ep, len, with) \
+ do { \
+ n2 = (ep) - (p); \
+ if (n2 > (len)) n2 = (len); \
+ if (n2 > 0) PRINT((p), n2); \
+ PAD((len) - (n2 > 0 ? n2 : 0), (with)); \
+ } while (0)
+
+/*
+ * The size of the buffer we use as scratch space for integer
+ * conversions, among other things. Technically, we would need the
+ * most space for base 10 conversions with thousands' grouping
+ * characters between each pair of digits. 100 bytes is a
+ * conservative overestimate even for a 128-bit uintmax_t.
+ */
+#define BUF 100
+
+#define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
+
+/*
+ * Flags used during conversion.
+ */
+#define ALT 0x0001 /* alternate form */
+#define LADJUST 0x0004 /* left adjustment */
+#define LONGDBL 0x0008 /* long double */
+#define LONGINT 0x0010 /* long integer */
+#define LLONGINT 0x0020 /* long long integer */
+#define SHORTINT 0x0040 /* short integer */
+#define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */
+#define FPT 0x0100 /* Floating point number */
+#define PTRINT 0x0200 /* (unsigned) ptrdiff_t */
+#define SIZEINT 0x0400 /* (signed) size_t */
+#define CHARINT 0x0800 /* 8 bit integer */
+#define MAXINT 0x1000 /* largest integer size (intmax_t) */
+
+/*
+ * Type ids for argument type table.
+ */
+#define T_UNUSED 0
+#define T_SHORT 1
+#define T_U_SHORT 2
+#define TP_SHORT 3
+#define T_INT 4
+#define T_U_INT 5
+#define TP_INT 6
+#define T_LONG 7
+#define T_U_LONG 8
+#define TP_LONG 9
+#define T_LLONG 10
+#define T_U_LLONG 11
+#define TP_LLONG 12
+#define T_DOUBLE 13
+#define T_LONG_DOUBLE 14
+#define TP_CHAR 15
+#define TP_VOID 16
+#define T_PTRINT 17
+#define TP_PTRINT 18
+#define T_SIZEINT 19
+#define T_SSIZEINT 20
+#define TP_SSIZEINT 21
+#define T_MAXINT 22
+#define T_MAXUINT 23
+#define TP_MAXINT 24
+#define T_CHAR 25
+#define T_U_CHAR 26
+#define T_WINT 27
+#define TP_WCHAR 28
+
+// To extend shorts properly, we need both signed and unsigned
+// argument extraction methods.
+#define SARG() \
+ ((intmax_t)(flags & MAXINT \
+ ? GETARG(intmax_t) \
+ : flags & LLONGINT \
+ ? GETARG(long long) \
+ : flags & LONGINT \
+ ? GETARG(long) \
+ : flags & PTRINT \
+ ? GETARG(ptrdiff_t) \
+ : flags & SIZEINT \
+ ? GETARG(ssize_t) \
+ : flags & SHORTINT \
+ ? (short)GETARG(int) \
+ : flags & CHARINT ? (signed char)GETARG(int) \
+ : GETARG(int)))
+#define UARG() \
+ ((uintmax_t)(flags & MAXINT \
+ ? GETARG(uintmax_t) \
+ : flags & LLONGINT \
+ ? GETARG(unsigned long long) \
+ : flags & LONGINT \
+ ? GETARG(unsigned long) \
+ : flags & PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
+ flags & SIZEINT \
+ ? GETARG(size_t) \
+ : flags & SHORTINT \
+ ? (unsigned short)GETARG(int) \
+ : flags & CHARINT ? (unsigned char)GETARG(int) \
+ : GETARG(unsigned int)))
+
+// Append a digit to a value and check for overflow.
+#define APPEND_DIGIT(val, dig) \
+ do { \
+ if ((val) > INT_MAX / 10) goto overflow; \
+ (val) *= 10; \
+ if ((val) > INT_MAX - to_digit((dig))) goto overflow; \
+ (val) += to_digit((dig)); \
+ } while (0)
+
+// Get * arguments, including the form *nn$. Preserve the nextarg
+// that the argument can be gotten once the type is determined.
+#define GETASTER(val) \
+ n2 = 0; \
+ cp = fmt; \
+ while (is_digit(*cp)) { \
+ APPEND_DIGIT(n2, *cp); \
+ cp++; \
+ } \
+ if (*cp == '$') { \
+ int hold = nextarg; \
+ if (argtable == NULL) { \
+ argtable = statargtable; \
+ if (__find_arguments(fmt0, orgap, &argtable, &argtablesiz) == -1) { \
+ ret = -1; \
+ goto error; \
+ } \
+ } \
+ nextarg = n2; \
+ val = GETARG(int); \
+ nextarg = hold; \
+ fmt = ++cp; \
+ } else { \
+ val = GETARG(int); \
+ }
+
+// Get the argument indexed by nextarg. If the argument table is
+// built, use it to get the argument. If its not, get the next
+// argument (and arguments must be gotten sequentially).
+#define GETARG(type) \
+ ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : (nextarg++, va_arg(ap, type)))
+
+/*
+ * Find all arguments when a positional parameter is encountered. Returns a
+ * table, indexed by argument number, of pointers to each arguments. The
+ * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
+ * It will be replaced with a mmap-ed one if it overflows (malloc cannot be
+ * used since we are attempting to make snprintf thread safe, and alloca is
+ * problematic since we have nested functions..)
+ */
+static int __find_arguments(const CHAR_TYPE* fmt0, va_list ap, union arg** argtable,
+ size_t* argtablesiz) {
+ int ch; /* character from fmt */
+ int n, n2; /* handy integer (short term usage) */
+ int flags; /* flags as above */
+ unsigned char* typetable; /* table of types */
+ unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
+ int tablesize; /* current size of type table */
+ int tablemax; /* largest used index in table */
+ int nextarg; /* 1-based argument index */
+ int ret = 0; /* return value */
+
+ /*
+ * Add an argument type to the table, expanding if necessary.
+ */
+#define ADDTYPE(type) \
+ ((nextarg >= tablesize) ? __grow_type_table(&typetable, &tablesize) : 0, \
+ (nextarg > tablemax) ? tablemax = nextarg : 0, typetable[nextarg++] = type)
+
+#define ADDSARG() \
+ ((flags & MAXINT) \
+ ? ADDTYPE(T_MAXINT) \
+ : ((flags & PTRINT) ? ADDTYPE(T_PTRINT) \
+ : ((flags & SIZEINT) \
+ ? ADDTYPE(T_SSIZEINT) \
+ : ((flags & LLONGINT) \
+ ? ADDTYPE(T_LLONG) \
+ : ((flags & LONGINT) \
+ ? ADDTYPE(T_LONG) \
+ : ((flags & SHORTINT) \
+ ? ADDTYPE(T_SHORT) \
+ : ((flags & CHARINT) ? ADDTYPE(T_CHAR) \
+ : ADDTYPE(T_INT))))))))
+
+#define ADDUARG() \
+ ((flags & MAXINT) \
+ ? ADDTYPE(T_MAXUINT) \
+ : ((flags & PTRINT) \
+ ? ADDTYPE(T_PTRINT) \
+ : ((flags & SIZEINT) \
+ ? ADDTYPE(T_SIZEINT) \
+ : ((flags & LLONGINT) \
+ ? ADDTYPE(T_U_LLONG) \
+ : ((flags & LONGINT) \
+ ? ADDTYPE(T_U_LONG) \
+ : ((flags & SHORTINT) \
+ ? ADDTYPE(T_U_SHORT) \
+ : ((flags & CHARINT) ? ADDTYPE(T_U_CHAR) \
+ : ADDTYPE(T_U_INT))))))))
+
+ /*
+ * Add * arguments to the type array.
+ */
+#define ADDASTER() \
+ n2 = 0; \
+ cp = fmt; \
+ while (is_digit(*cp)) { \
+ APPEND_DIGIT(n2, *cp); \
+ cp++; \
+ } \
+ if (*cp == '$') { \
+ int hold = nextarg; \
+ nextarg = n2; \
+ ADDTYPE(T_INT); \
+ nextarg = hold; \
+ fmt = ++cp; \
+ } else { \
+ ADDTYPE(T_INT); \
+ }
+ CHAR_TYPE* fmt = const_cast<CHAR_TYPE*>(fmt0);
+ CHAR_TYPE* cp;
+ typetable = stattypetable;
+ tablesize = STATIC_ARG_TBL_SIZE;
+ tablemax = 0;
+ nextarg = 1;
+ memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
+
+ /*
+ * Scan the format for conversions (`%' character).
+ */
+ for (;;) {
+ for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) continue;
+ if (ch == '\0') goto done;
+ fmt++; /* skip over '%' */
+
+ flags = 0;
+
+ rflag:
+ ch = *fmt++;
+ reswitch:
+ switch (ch) {
+ case ' ':
+ case '#':
+ case '\'':
+ goto rflag;
+ case '*':
+ ADDASTER();
+ goto rflag;
+ case '-':
+ case '+':
+ goto rflag;
+ case '.':
+ if ((ch = *fmt++) == '*') {
+ ADDASTER();
+ goto rflag;
+ }
+ while (is_digit(ch)) {
+ ch = *fmt++;
+ }
+ goto reswitch;
+ case '0':
+ goto rflag;
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ n = 0;
+ do {
+ APPEND_DIGIT(n, ch);
+ ch = *fmt++;
+ } while (is_digit(ch));
+ if (ch == '$') {
+ nextarg = n;
+ goto rflag;
+ }
+ goto reswitch;
+ case 'L':
+ flags |= LONGDBL;
+ goto rflag;
+ case 'h':
+ if (*fmt == 'h') {
+ fmt++;
+ flags |= CHARINT;
+ } else {
+ flags |= SHORTINT;
+ }
+ goto rflag;
+ case 'j':
+ flags |= MAXINT;
+ goto rflag;
+ case 'l':
+ if (*fmt == 'l') {
+ fmt++;
+ flags |= LLONGINT;
+ } else {
+ flags |= LONGINT;
+ }
+ goto rflag;
+ case 'q':
+ flags |= LLONGINT;
+ goto rflag;
+ case 't':
+ flags |= PTRINT;
+ goto rflag;
+ case 'z':
+ flags |= SIZEINT;
+ goto rflag;
+ case 'C':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'c':
+ if (flags & LONGINT)
+ ADDTYPE(T_WINT);
+ else
+ ADDTYPE(T_INT);
+ break;
+ case 'D':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'd':
+ case 'i':
+ ADDSARG();
+ break;
+ case 'a':
+ case 'A':
+ case 'e':
+ case 'E':
+ case 'f':
+ case 'F':
+ case 'g':
+ case 'G':
+ if (flags & LONGDBL)
+ ADDTYPE(T_LONG_DOUBLE);
+ else
+ ADDTYPE(T_DOUBLE);
+ break;
+#ifndef NO_PRINTF_PERCENT_N
+ case 'n':
+ if (flags & LLONGINT)
+ ADDTYPE(TP_LLONG);
+ else if (flags & LONGINT)
+ ADDTYPE(TP_LONG);
+ else if (flags & SHORTINT)
+ ADDTYPE(TP_SHORT);
+ else if (flags & PTRINT)
+ ADDTYPE(TP_PTRINT);
+ else if (flags & SIZEINT)
+ ADDTYPE(TP_SSIZEINT);
+ else if (flags & MAXINT)
+ ADDTYPE(TP_MAXINT);
+ else
+ ADDTYPE(TP_INT);
+ continue; /* no output */
+#endif /* NO_PRINTF_PERCENT_N */
+ case 'O':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'o':
+ ADDUARG();
+ break;
+ case 'p':
+ ADDTYPE(TP_VOID);
+ break;
+ case 'S':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 's':
+ ADDTYPE((flags & LONGINT) ? TP_WCHAR : TP_CHAR);
+ break;
+ case 'U':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'u':
+ case 'X':
+ case 'x':
+ ADDUARG();
+ break;
+ default: /* "%?" prints ?, unless ? is NUL */
+ if (ch == '\0') goto done;
+ break;
+ }
+ }
+done:
+ /*
+ * Build the argument table.
+ */
+ if (tablemax >= STATIC_ARG_TBL_SIZE) {
+ *argtablesiz = sizeof(union arg) * (tablemax + 1);
+ *argtable = static_cast<arg*>(mmap(NULL, *argtablesiz,
+ PROT_WRITE | PROT_READ,
+ MAP_ANON | MAP_PRIVATE, -1, 0));
+ if (*argtable == MAP_FAILED) return -1;
+ }
+
+ for (n = 1; n <= tablemax; n++) {
+ switch (typetable[n]) {
+ case T_UNUSED:
+ case T_CHAR:
+ case T_U_CHAR:
+ case T_SHORT:
+ case T_U_SHORT:
+ case T_INT:
+ (*argtable)[n].intarg = va_arg(ap, int);
+ break;
+ case TP_SHORT:
+ (*argtable)[n].pshortarg = va_arg(ap, short*);
+ break;
+ case T_U_INT:
+ (*argtable)[n].uintarg = va_arg(ap, unsigned int);
+ break;
+ case TP_INT:
+ (*argtable)[n].pintarg = va_arg(ap, int*);
+ break;
+ case T_LONG:
+ (*argtable)[n].longarg = va_arg(ap, long);
+ break;
+ case T_U_LONG:
+ (*argtable)[n].ulongarg = va_arg(ap, unsigned long);
+ break;
+ case TP_LONG:
+ (*argtable)[n].plongarg = va_arg(ap, long*);
+ break;
+ case T_LLONG:
+ (*argtable)[n].longlongarg = va_arg(ap, long long);
+ break;
+ case T_U_LLONG:
+ (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long);
+ break;
+ case TP_LLONG:
+ (*argtable)[n].plonglongarg = va_arg(ap, long long*);
+ break;
+ case T_DOUBLE:
+ (*argtable)[n].doublearg = va_arg(ap, double);
+ break;
+ case T_LONG_DOUBLE:
+ (*argtable)[n].longdoublearg = va_arg(ap, long double);
+ break;
+ case TP_CHAR:
+ (*argtable)[n].pchararg = va_arg(ap, char*);
+ break;
+ case TP_VOID:
+ (*argtable)[n].pvoidarg = va_arg(ap, void*);
+ break;
+ case T_PTRINT:
+ (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t);
+ break;
+ case TP_PTRINT:
+ (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t*);
+ break;
+ case T_SIZEINT:
+ (*argtable)[n].sizearg = va_arg(ap, size_t);
+ break;
+ case T_SSIZEINT:
+ (*argtable)[n].ssizearg = va_arg(ap, ssize_t);
+ break;
+ case TP_SSIZEINT:
+ (*argtable)[n].pssizearg = va_arg(ap, ssize_t*);
+ break;
+ case T_MAXINT:
+ (*argtable)[n].intmaxarg = va_arg(ap, intmax_t);
+ break;
+ case T_MAXUINT:
+ (*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t);
+ break;
+ case TP_MAXINT:
+ (*argtable)[n].pintmaxarg = va_arg(ap, intmax_t*);
+ break;
+ case T_WINT:
+ (*argtable)[n].wintarg = va_arg(ap, wint_t);
+ break;
+ case TP_WCHAR:
+ (*argtable)[n].pwchararg = va_arg(ap, wchar_t*);
+ break;
+ }
+ }
+ goto finish;
+
+overflow:
+ errno = ENOMEM;
+ ret = -1;
+
+finish:
+ if (typetable != NULL && typetable != stattypetable) {
+ munmap(typetable, *argtablesiz);
+ typetable = NULL;
+ }
+ return (ret);
+}
+
+/*
+ * Increase the size of the type table.
+ */
+static int __grow_type_table(unsigned char** typetable, int* tablesize) {
+ unsigned char* old_table = *typetable;
+ int new_size = *tablesize * 2;
+
+ if (new_size < getpagesize()) new_size = getpagesize();
+
+ if (*tablesize == STATIC_ARG_TBL_SIZE) {
+ *typetable = static_cast<unsigned char*>(mmap(NULL, new_size,
+ PROT_WRITE | PROT_READ,
+ MAP_ANON | MAP_PRIVATE, -1, 0));
+ if (*typetable == MAP_FAILED) return -1;
+ bcopy(old_table, *typetable, *tablesize);
+ } else {
+ unsigned char* new_table = static_cast<unsigned char*>(mmap(NULL, new_size,
+ PROT_WRITE | PROT_READ,
+ MAP_ANON | MAP_PRIVATE, -1, 0));
+ if (new_table == MAP_FAILED) return -1;
+ memmove(new_table, *typetable, *tablesize);
+ munmap(*typetable, *tablesize);
+ *typetable = new_table;
+ }
+ memset(*typetable + *tablesize, T_UNUSED, (new_size - *tablesize));
+
+ *tablesize = new_size;
+ return 0;
+}