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printf-parse.c
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/* Formatted output to strings. Copyright (C) 1999-2000, 2002-2003, 2006-2008 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* This file can be parametrized with the following macros: CHAR_T The element type of the format string. CHAR_T_ONLY_ASCII Set to 1 to enable verification that all characters in the format string are ASCII. DIRECTIVE Structure denoting a format directive. Depends on CHAR_T. DIRECTIVES Structure denoting the set of format directives of a format string. Depends on CHAR_T. PRINTF_PARSE Function that parses a format string. Depends on CHAR_T. STATIC Set to 'static' to declare the function static. ENABLE_UNISTDIO Set to 1 to enable the unistdio extensions. */ #ifndef PRINTF_PARSE # include <config.h> #endif /* Specification. */ #ifndef PRINTF_PARSE # include "printf-parse.h" #endif /* Default parameters. */ #ifndef PRINTF_PARSE # define PRINTF_PARSE printf_parse # define CHAR_T char # define DIRECTIVE char_directive # define DIRECTIVES char_directives #endif /* Get size_t, NULL. */ #include <stddef.h> /* Get intmax_t. */ #if defined IN_LIBINTL || defined IN_LIBASPRINTF # if HAVE_STDINT_H_WITH_UINTMAX # include <stdint.h> # endif # if HAVE_INTTYPES_H_WITH_UINTMAX # include <inttypes.h> # endif #else # include <stdint.h> #endif /* malloc(), realloc(), free(). */ #include <stdlib.h> /* errno. */ #include <errno.h> /* Checked size_t computations. */ #include "xsize.h" #if CHAR_T_ONLY_ASCII /* c_isascii(). */ # include "c-ctype.h" #endif #ifdef STATIC STATIC #endif int PRINTF_PARSE (const CHAR_T *format, DIRECTIVES *d, arguments *a) { const CHAR_T *cp = format; /* pointer into format */ size_t arg_posn = 0; /* number of regular arguments consumed */ size_t d_allocated; /* allocated elements of d->dir */ size_t a_allocated; /* allocated elements of a->arg */ size_t max_width_length = 0; size_t max_precision_length = 0; d->count = 0; d_allocated = 1; d->dir = (DIRECTIVE *) malloc (d_allocated * sizeof (DIRECTIVE)); if (d->dir == NULL) /* Out of memory. */ goto out_of_memory_1; a->count = 0; a_allocated = 0; a->arg = NULL; #define REGISTER_ARG(_index_,_type_) \ { \ size_t n = (_index_); \ if (n >= a_allocated) \ { \ size_t memory_size; \ argument *memory; \ \ a_allocated = xtimes (a_allocated, 2); \ if (a_allocated <= n) \ a_allocated = xsum (n, 1); \ memory_size = xtimes (a_allocated, sizeof (argument)); \ if (size_overflow_p (memory_size)) \ /* Overflow, would lead to out of memory. */ \ goto out_of_memory; \ memory = (argument *) (a->arg \ ? realloc (a->arg, memory_size) \ : malloc (memory_size)); \ if (memory == NULL) \ /* Out of memory. */ \ goto out_of_memory; \ a->arg = memory; \ } \ while (a->count <= n) \ a->arg[a->count++].type = TYPE_NONE; \ if (a->arg[n].type == TYPE_NONE) \ a->arg[n].type = (_type_); \ else if (a->arg[n].type != (_type_)) \ /* Ambiguous type for positional argument. */ \ goto error; \ } while (*cp != '\0') { CHAR_T c = *cp++; if (c == '%') { size_t arg_index = ARG_NONE; DIRECTIVE *dp = &d->dir[d->count]; /* pointer to next directive */ /* Initialize the next directive. */ dp->dir_start = cp - 1; dp->flags = 0; dp->width_start = NULL; dp->width_end = NULL; dp->width_arg_index = ARG_NONE; dp->precision_start = NULL; dp->precision_end = NULL; dp->precision_arg_index = ARG_NONE; dp->arg_index = ARG_NONE; /* Test for positional argument. */ if (*cp >= '0' && *cp <= '9') { const CHAR_T *np; for (np = cp; *np >= '0' && *np <= '9'; np++) ; if (*np == '$') { size_t n = 0; for (np = cp; *np >= '0' && *np <= '9'; np++) n = xsum (xtimes (n, 10), *np - '0'); if (n == 0) /* Positional argument 0. */ goto error; if (size_overflow_p (n)) /* n too large, would lead to out of memory later. */ goto error; arg_index = n - 1; cp = np + 1; } } /* Read the flags. */ for (;;) { if (*cp == '\'') { dp->flags |= FLAG_GROUP; cp++; } else if (*cp == '-') { dp->flags |= FLAG_LEFT; cp++; } else if (*cp == '+') { dp->flags |= FLAG_SHOWSIGN; cp++; } else if (*cp == ' ') { dp->flags |= FLAG_SPACE; cp++; } else if (*cp == '#') { dp->flags |= FLAG_ALT; cp++; } else if (*cp == '0') { dp->flags |= FLAG_ZERO; cp++; } else break; } /* Parse the field width. */ if (*cp == '*') { dp->width_start = cp; cp++; dp->width_end = cp; if (max_width_length < 1) max_width_length = 1; /* Test for positional argument. */ if (*cp >= '0' && *cp <= '9') { const CHAR_T *np; for (np = cp; *np >= '0' && *np <= '9'; np++) ; if (*np == '$') { size_t n = 0; for (np = cp; *np >= '0' && *np <= '9'; np++) n = xsum (xtimes (n, 10), *np - '0'); if (n == 0) /* Positional argument 0. */ goto error; if (size_overflow_p (n)) /* n too large, would lead to out of memory later. */ goto error; dp->width_arg_index = n - 1; cp = np + 1; } } if (dp->width_arg_index == ARG_NONE) { dp->width_arg_index = arg_posn++; if (dp->width_arg_index == ARG_NONE) /* arg_posn wrapped around. */ goto error; } REGISTER_ARG (dp->width_arg_index, TYPE_INT); } else if (*cp >= '0' && *cp <= '9') { size_t width_length; dp->width_start = cp; for (; *cp >= '0' && *cp <= '9'; cp++) ; dp->width_end = cp; width_length = dp->width_end - dp->width_start; if (max_width_length < width_length) max_width_length = width_length; } /* Parse the precision. */ if (*cp == '.') { cp++; if (*cp == '*') { dp->precision_start = cp - 1; cp++; dp->precision_end = cp; if (max_precision_length < 2) max_precision_length = 2; /* Test for positional argument. */ if (*cp >= '0' && *cp <= '9') { const CHAR_T *np; for (np = cp; *np >= '0' && *np <= '9'; np++) ; if (*np == '$') { size_t n = 0; for (np = cp; *np >= '0' && *np <= '9'; np++) n = xsum (xtimes (n, 10), *np - '0'); if (n == 0) /* Positional argument 0. */ goto error; if (size_overflow_p (n)) /* n too large, would lead to out of memory later. */ goto error; dp->precision_arg_index = n - 1; cp = np + 1; } } if (dp->precision_arg_index == ARG_NONE) { dp->precision_arg_index = arg_posn++; if (dp->precision_arg_index == ARG_NONE) /* arg_posn wrapped around. */ goto error; } REGISTER_ARG (dp->precision_arg_index, TYPE_INT); } else { size_t precision_length; dp->precision_start = cp - 1; for (; *cp >= '0' && *cp <= '9'; cp++) ; dp->precision_end = cp; precision_length = dp->precision_end - dp->precision_start; if (max_precision_length < precision_length) max_precision_length = precision_length; } } { arg_type type; /* Parse argument type/size specifiers. */ { int flags = 0; for (;;) { if (*cp == 'h') { flags |= (1 << (flags & 1)); cp++; } else if (*cp == 'L') { flags |= 4; cp++; } else if (*cp == 'l') { flags += 8; cp++; } else if (*cp == 'j') { if (sizeof (intmax_t) > sizeof (long)) { /* intmax_t = long long */ flags += 16; } else if (sizeof (intmax_t) > sizeof (int)) { /* intmax_t = long */ flags += 8; } cp++; } else if (*cp == 'z' || *cp == 'Z') { /* 'z' is standardized in ISO C 99, but glibc uses 'Z' because the warning facility in gcc-2.95.2 understands only 'Z' (see gcc-2.95.2/gcc/c-common.c:1784). */ if (sizeof (size_t) > sizeof (long)) { /* size_t = long long */ flags += 16; } else if (sizeof (size_t) > sizeof (int)) { /* size_t = long */ flags += 8; } cp++; } else if (*cp == 't') { if (sizeof (ptrdiff_t) > sizeof (long)) { /* ptrdiff_t = long long */ flags += 16; } else if (sizeof (ptrdiff_t) > sizeof (int)) { /* ptrdiff_t = long */ flags += 8; } cp++; } #if defined __APPLE__ && defined __MACH__ /* On MacOS X 10.3, PRIdMAX is defined as "qd". We cannot change it to "lld" because PRIdMAX must also be understood by the system's printf routines. */ else if (*cp == 'q') { if (64 / 8 > sizeof (long)) { /* int64_t = long long */ flags += 16; } else { /* int64_t = long */ flags += 8; } cp++; } #endif #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ /* On native Win32, PRIdMAX is defined as "I64d". We cannot change it to "lld" because PRIdMAX must also be understood by the system's printf routines. */ else if (*cp == 'I' && cp[1] == '6' && cp[2] == '4') { if (64 / 8 > sizeof (long)) { /* __int64 = long long */ flags += 16; } else { /* __int64 = long */ flags += 8; } cp += 3; } #endif else break; } /* Read the conversion character. */ c = *cp++; switch (c) { case 'd': case 'i': #if HAVE_LONG_LONG_INT /* If 'long long' exists and is larger than 'long': */ if (flags >= 16 || (flags & 4)) type = TYPE_LONGLONGINT; else #endif /* If 'long long' exists and is the same as 'long', we parse "lld" into TYPE_LONGINT. */ if (flags >= 8) type = TYPE_LONGINT; else if (flags & 2) type = TYPE_SCHAR; else if (flags & 1) type = TYPE_SHORT; else type = TYPE_INT; break; case 'o': case 'u': case 'x': case 'X': #if HAVE_LONG_LONG_INT /* If 'long long' exists and is larger than 'long': */ if (flags >= 16 || (flags & 4)) type = TYPE_ULONGLONGINT; else #endif /* If 'unsigned long long' exists and is the same as 'unsigned long', we parse "llu" into TYPE_ULONGINT. */ if (flags >= 8) type = TYPE_ULONGINT; else if (flags & 2) type = TYPE_UCHAR; else if (flags & 1) type = TYPE_USHORT; else type = TYPE_UINT; break; case 'f': case 'F': case 'e': case 'E': case 'g': case 'G': case 'a': case 'A': if (flags >= 16 || (flags & 4)) type = TYPE_LONGDOUBLE; else type = TYPE_DOUBLE; break; case 'c': if (flags >= 8) #if HAVE_WINT_T type = TYPE_WIDE_CHAR; #else goto error; #endif else type = TYPE_CHAR; break; #if HAVE_WINT_T case 'C': type = TYPE_WIDE_CHAR; c = 'c'; break; #endif case 's': if (flags >= 8) #if HAVE_WCHAR_T type = TYPE_WIDE_STRING; #else goto error; #endif else type = TYPE_STRING; break; #if HAVE_WCHAR_T case 'S': type = TYPE_WIDE_STRING; c = 's'; break; #endif case 'p': type = TYPE_POINTER; break; case 'n': #if HAVE_LONG_LONG_INT /* If 'long long' exists and is larger than 'long': */ if (flags >= 16 || (flags & 4)) type = TYPE_COUNT_LONGLONGINT_POINTER; else #endif /* If 'long long' exists and is the same as 'long', we parse "lln" into TYPE_COUNT_LONGINT_POINTER. */ if (flags >= 8) type = TYPE_COUNT_LONGINT_POINTER; else if (flags & 2) type = TYPE_COUNT_SCHAR_POINTER; else if (flags & 1) type = TYPE_COUNT_SHORT_POINTER; else type = TYPE_COUNT_INT_POINTER; break; #if ENABLE_UNISTDIO /* The unistdio extensions. */ case 'U': if (flags >= 16) type = TYPE_U32_STRING; else if (flags >= 8) type = TYPE_U16_STRING; else type = TYPE_U8_STRING; break; #endif case '%': type = TYPE_NONE; break; default: /* Unknown conversion character. */ goto error; } } if (type != TYPE_NONE) { dp->arg_index = arg_index; if (dp->arg_index == ARG_NONE) { dp->arg_index = arg_posn++; if (dp->arg_index == ARG_NONE) /* arg_posn wrapped around. */ goto error; } REGISTER_ARG (dp->arg_index, type); } dp->conversion = c; dp->dir_end = cp; } d->count++; if (d->count >= d_allocated) { size_t memory_size; DIRECTIVE *memory; d_allocated = xtimes (d_allocated, 2); memory_size = xtimes (d_allocated, sizeof (DIRECTIVE)); if (size_overflow_p (memory_size)) /* Overflow, would lead to out of memory. */ goto out_of_memory; memory = (DIRECTIVE *) realloc (d->dir, memory_size); if (memory == NULL) /* Out of memory. */ goto out_of_memory; d->dir = memory; } } #if CHAR_T_ONLY_ASCII else if (!c_isascii (c)) { /* Non-ASCII character. Not supported. */ goto error; } #endif } d->dir[d->count].dir_start = cp; d->max_width_length = max_width_length; d->max_precision_length = max_precision_length; return 0; error: if (a->arg) free (a->arg); if (d->dir) free (d->dir); errno = EINVAL; return -1; out_of_memory: if (a->arg) free (a->arg); if (d->dir) free (d->dir); out_of_memory_1: errno = ENOMEM; return -1; } #undef PRINTF_PARSE #undef DIRECTIVES #undef DIRECTIVE #undef CHAR_T_ONLY_ASCII #undef CHAR_T