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/* Implementation of o_vscanf for GNUstep Base Library
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Reworked by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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/* Copyright (C) 1991, 1992, 1993, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02111, USA. */
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/* Reworked from glibc by Andrew McCallum:
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Fixed bug by adding "*f == 'a'" to type modifier checking.
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Declared extern strtod and strtol.
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Use function pointer argument to get next character.
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Use objc_malloc() instead of malloc()
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Use objc_realloc() instead of realloc()
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This is a solution for StdioStream and MemoryStream.
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It isn't ideal. Anyone have other suggestions? */
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/* #include <ansidecl.h> */
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/* #include <localeinfo.h> */
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#include <objc/objc-api.h>
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extern double strtod(const char *str, char **ptr);
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extern long strtol(const char *str, char** ptr, int base);
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#define LONGLONG long long
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#define LONG_DOUBLE long double
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/* #define inchar() ((c = getc(s)) == EOF ? EOF : (++read_in, c))*/
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#define inchar() ((c = (*inchar_func)(stream)) == EOF ? EOF : (++read_in, c))
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/* #define conv_error() return ((c == EOF || ungetc(c, s)), done) */
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//#define conv_error() return ((c == EOF || ((*unchar_func)(stream,c),c)), done)
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#define conv_error() return (c==EOF ? done : ((*unchar_func)(stream,c), done))
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#define input_error() return (done == 0 ? EOF : done)
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#define memory_error() return ((errno = ENOMEM), EOF)
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/* Read formatted input from STREAM according to the format string
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FORMAT, using the argument list in ARGPTR.
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Return the number of assignments made, or -1 for an input error. */
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o_vscanf (void *stream,
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int (*inchar_func)(void*),
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void (*unchar_func)(void*,int),
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const char *format, va_list arg)
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register CONST char *f = format;
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register char fc; /* Current character of the format. */
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register size_t done = 0; /* Assignments done. */
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register size_t read_in = 0; /* Chars read in. */
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register int c; /* Last char read. */
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register int do_assign; /* Whether to do an assignment. */
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register int width; /* Maximum field width. */
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/* Type modifiers. */
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char is_short, is_long, is_long_double;
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/* We use the `L' modifier for `long long int'. */
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#define is_longlong is_long_double
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#define is_longlong 0
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int malloc_string; /* Args are char ** to be filled in. */
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/* Status for reading F-P nums. */
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/* If a [...] is a [^...]. */
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/* Base for integral numbers. */
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/* Signedness for integral numbers. */
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/* Integral holding variables. */
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unsigned long int unum;
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/* Floating-point holding variable. */
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/* Character-buffer pointer. */
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register char *str, **strptr;
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char *w; /* Pointer into WORK. */
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wchar_t decimal; /* Decimal point character. */
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if (!__validfp(s) || !s->__mode.__read || format == NULL)
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/* Figure out the decimal point character. */
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if (mbtowc(&decimal, _numeric_info->decimal_point,
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strlen(_numeric_info->decimal_point)) <= 0)
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decimal = (wchar_t) *_numeric_info->decimal_point;
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/* Run through the format string. */
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/* Non-ASCII, may be a multibyte. */
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int len = mblen(f, strlen(f));
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/* Characters other than format specs must just match. */
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/* Whitespace characters match any amount of whitespace. */
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/* Check for the assignment-suppressant. */
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/* Find the maximum field width. */
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/* Check for type modifiers. */
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is_short = is_long = is_long_double = malloc_string = 0;
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while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a')
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/* int's are short int's. */
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/* A double `l' is equivalent to an `L'. */
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/* int's are long int's. */
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/* double's are long double's, and int's are long long int's. */
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/* String conversions (%s, %[) take a `char **'
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arg and fill it in with a malloc'd pointer. */
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/* End of the format string? */
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/* Find the conversion specifier. */
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if (fc != '[' && fc != 'c' && fc != 'n')
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/* Eat whitespace. */
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case '%': /* Must match a literal '%'. */
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case 'n': /* Answer number of assignments done. */
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*va_arg(arg, int *) = read_in;
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case 'c': /* Match characters. */
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str = va_arg (arg, char *);
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while (inchar() != EOF && --width > 0);
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while (inchar() != EOF && width > 0)
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case 's': /* Read a string. */
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/* The string is to be stored in a malloc'd buffer. */ \
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strptr = va_arg (arg, char **); \
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if (strptr == NULL) \
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/* Allocate an initial buffer. */ \
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*strptr = str = objc_malloc (strsize); \
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str = va_arg (arg, char *); \
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#define STRING_ADD_CHAR(c) \
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if (malloc_string && str == *strptr + strsize) \
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/* Enlarge the buffer. */ \
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str = objc_realloc (*strptr, strsize * 2); \
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/* Can't allocate that much. Last-ditch effort. */\
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str = objc_realloc (*strptr, strsize + 1); \
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/* We lose. Oh well. \
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Terminate the string and stop converting, \
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so at least we don't swallow any input. */ \
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(*strptr)[strsize] = '\0'; \
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} while (inchar () != EOF && (width <= 0 || --width > 0));
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case 'x': /* Hexadecimal integer. */
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case 'X': /* Ditto. */
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case 'o': /* Octal integer. */
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case 'u': /* Unsigned decimal integer. */
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case 'd': /* Signed decimal integer. */
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case 'i': /* Generic number. */
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/* Check for a sign. */
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if (c == '-' || c == '+')
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/* Look for a leading indication of base. */
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if (tolower(c) == 'x')
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/* Read the number into WORK. */
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if (base == 16 ? !isxdigit(c) :
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(!isdigit(c) || c - '0' >= base))
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} while (inchar() != EOF && width != 0);
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(w - work == 1 && (work[0] == '+' || work[0] == '-')))
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/* There was on number. */
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/* Convert the number. */
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num = strtol (work, &w, base);
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unum = strtoul (work, &w, base);
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unum = (unsigned long) strtol (work, &w, base);
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*va_arg (arg, unsigned LONGLONG int *) = unum;
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*va_arg (arg, unsigned long int *) = unum;
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*va_arg (arg, unsigned short int *)
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= (unsigned short int) unum;
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*va_arg(arg, unsigned int *) = (unsigned int) unum;
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*va_arg(arg, LONGLONG int *) = num;
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*va_arg(arg, long int *) = num;
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*va_arg(arg, short int *) = (short int) num;
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*va_arg(arg, int *) = (int) num;
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case 'e': /* Floating-point numbers. */
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/* Check for a sign. */
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if (c == '-' || c == '+')
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/* EOF is only an input error before we read any chars. */
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else if (got_e && w[-1] == 'e' && (c == '-' || c == '+'))
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else if (!got_e && tolower(c) == 'e')
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else if (c == decimal && !got_dot)
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} while (inchar() != EOF && width != 0);
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if (w[-1] == '-' || w[-1] == '+' || w[-1] == 'e')
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/* Convert the number. */
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fp_num = strtod(work, &w);
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*va_arg(arg, LONG_DOUBLE *) = fp_num;
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*va_arg(arg, double *) = (double) fp_num;
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*va_arg(arg, float *) = (float) fp_num;
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#endif /* MIB_HACKS */
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case '[': /* Character class. */
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while ((fc = *f++) != '\0' && fc != ']')
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if (fc == '-' && *f != '\0' && *f != ']' &&
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w > work && w[-1] <= *f)
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/* Add all characters from the one before the '-'
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up to (but not including) the next format char. */
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for (fc = w[-1] + 1; fc < *f; ++fc)
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/* Add the character to the list. */
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if ((strchr (work, c) == NULL) != not_in)
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} while (inchar () != EOF && width != 0);
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case 'p': /* Generic pointer. */
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/* A PTR must be the same size as a `long int'. */
added
removed
Source/o_vscanf.c
