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Diffstat (limited to 'stdlib/strfmon.c')
| -rw-r--r-- | stdlib/strfmon.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/stdlib/strfmon.c b/stdlib/strfmon.c new file mode 100644 index 0000000..2074f29 --- /dev/null +++ b/stdlib/strfmon.c @@ -0,0 +1,504 @@ +/* strfmon -- formating a monetary value according to the current locale +Copyright (C) 1996 Free Software Foundation, Inc. +This file is part of the GNU C Library. +Contributed by Ulrich Drepper <drepper@cygnus.com> +and Jochen Hein <Jochen.Hein@informatik.TU-Clausthal.de>, 1996. + +The GNU C Library 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 of the +License, or (at your option) any later version. + +The GNU C Library 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 the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +#include <ctype.h> +#include <errno.h> +#include <langinfo.h> +#include <monetary.h> +#ifdef USE_IN_LIBIO +# include "../libio/libioP.h" +# include "../libio/strfile.h" +#endif +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include "../stdio-common/printf.h" +#include "../locale/localeinfo.h" + + +#define out_char(Ch) \ + do { \ + if (dest >= s + maxsize - 1) \ + { \ + errno = E2BIG; \ + va_end (ap); \ + return -1; \ + } \ + *dest++ = (Ch); \ + } while (0) + +#define out_string(String) \ + do { \ + const char *_s = (String); \ + while (*_s) \ + out_char (*_s++); \ + } while (0) + +#define to_digit(Ch) ((Ch) - '0') + +extern int __printf_fp (FILE *, const struct printf_info *, + const void **const); +/* This function determines the number of digit groups in the output. + The definition is in printf_fp.c. */ +extern unsigned int __guess_grouping (unsigned int intdig_max, + const char *grouping, wchar_t sepchar); + + +/* We have to overcome some problems with this implementation. On the + one hand the strfmon() function is specified by in XPG4 and of + course it has to follow this. But on the other hand POSIX.2 + specifies some information in the LC_MONETARY category which should + be used, too. Some of the information contradicts the information + which can be specified in format string. */ +ssize_t +strfmon (char *s, size_t maxsize, const char *format, ...) +{ +#ifdef USE_IN_LIBIO + _IO_strfile f; +#else + FILE f; +#endif + struct printf_info info; + va_list ap; /* Scan through the varargs. */ + char *dest; /* Pointer so copy the output. */ + const char *fmt; /* Pointer that walks through format. */ + + va_start (ap, format); + + dest = s; + fmt = format; + + /* Loop through the format-string. */ + while (*fmt != '\0') + { + /* The floating-point value to output. */ + union + { + double dbl; + __long_double_t ldbl; + } + fpnum; + int print_curr_symbol; + int left_prec; + int right_prec; + int group; + char pad; + int is_long_double; + int p_sign_posn; + int n_sign_posn; + int sign_posn; + int left; + int is_negative; + int sep_by_space; + int cs_precedes; + char sign_char; + int done; + const char *currency_symbol; + int width; + char *startp; + const void *ptr; + + /* Process all character which do not introduce a format + specification. */ + if (*fmt != '%') + { + out_char (*fmt++); + continue; + } + + /* "%%" means a single '%' character. */ + if (fmt[1] == '%') + { + out_char (*++fmt); + ++fmt; + continue; + } + + /* Defaults for formatting. */ + print_curr_symbol = 1; /* Print the currency symbol. */ + left_prec = -1; /* No left precision specified. */ + right_prec = -1; /* No right precision specified. */ + group = 1; /* Print digits grouped. */ + pad = ' '; /* Fill character is <SP>. */ + is_long_double = 0; /* Double argument by default. */ + p_sign_posn = -1; /* This indicates whether the */ + n_sign_posn = -1; /* '(' flag is given. */ + width = -1; /* No width specified so far. */ + left = 0; /* Right justified by default. */ + + /* Parse group characters. */ + while (1) + { + switch (*++fmt) + { + case '=': /* Set fill character. */ + pad = *++fmt; + continue; + case '^': /* Don't group digits. */ + group = 0; + continue; + case '+': /* Use +/- for sign of number. */ + if (n_sign_posn != -1) + { + errno = EINVAL; + va_end (ap); + return -1; + } + if (*_NL_CURRENT (LC_MONETARY, P_SIGN_POSN) == '\0') + p_sign_posn = 1; + else + p_sign_posn = *_NL_CURRENT (LC_MONETARY, P_SIGN_POSN); + if (*_NL_CURRENT (LC_MONETARY, N_SIGN_POSN) == '\0') + n_sign_posn = 1; + else + n_sign_posn = *_NL_CURRENT (LC_MONETARY, N_SIGN_POSN); + continue; + case '(': /* Use ( ) for negative sign. */ + if (n_sign_posn != -1) + { + errno = EINVAL; + va_end (ap); + return -1; + } + n_sign_posn = 5; /* This is a else unused value. */ + continue; + case '!': /* Don't print the currency symbol. */ + print_curr_symbol = 0; + continue; + case '-': /* Print left justified. */ + left = 1; + continue; + default: + /* Will stop the loop. */; + } + break; + } + + if (isdigit (*fmt)) + { + /* Parse field width. */ + width = to_digit (*fmt); + + while (isdigit (*++fmt)) + { + width *= 10; + width += to_digit (*fmt); + } + + /* If we don't have enough room for the demanded width we + can stop now and return an error. */ + if (dest + width >= s + maxsize) + { + errno = E2BIG; + va_end (ap); + return -1; + } + } + + /* Recognize left precision. */ + if (*fmt == '#') + { + if (!isdigit (*++fmt)) + { + errno = EINVAL; + va_end (ap); + return -1; + } + left_prec = to_digit (*fmt); + + while (isdigit (*++fmt)) + { + left_prec *= 10; + left_prec += to_digit (*fmt); + } + } + + /* Recognize right precision. */ + if (*fmt == '.') + { + if (!isdigit (*++fmt)) + { + errno = EINVAL; + va_end (ap); + return -1; + } + right_prec = to_digit (*fmt); + + while (isdigit (*++fmt)) + { + right_prec *= 10; + right_prec += to_digit (*fmt); + } + } + + /* Handle modifier. This is an extension. */ + if (*fmt == 'L') + { + ++fmt; + is_long_double = 1; + } + + /* Handle format specifier. */ + switch (*fmt++) + { + case 'i': /* Use international currency symbol. */ + currency_symbol = _NL_CURRENT (LC_MONETARY, INT_CURR_SYMBOL); + if (right_prec == -1) + if (*_NL_CURRENT (LC_MONETARY, INT_FRAC_DIGITS) == '\177') + right_prec = 2; + else + right_prec = *_NL_CURRENT (LC_MONETARY, INT_FRAC_DIGITS); + break; + case 'n': /* Use national currency symbol. */ + currency_symbol = _NL_CURRENT (LC_MONETARY, CURRENCY_SYMBOL); + if (right_prec == -1) + if (*_NL_CURRENT (LC_MONETARY, FRAC_DIGITS) == '\177') + right_prec = 2; + else + right_prec = *_NL_CURRENT (LC_MONETARY, FRAC_DIGITS); + break; + default: /* Any unrecognized format is an error. */ + errno = EINVAL; + va_end (ap); + return -1; + } + + /* If we have to print the digits grouped determine how many + extra characters this means. */ + if (group && left_prec != -1) + left_prec += __guess_grouping (left_prec, + _NL_CURRENT (LC_MONETARY, MON_GROUPING), + *_NL_CURRENT (LC_MONETARY, + MON_THOUSANDS_SEP)); + + /* Now it's time to get the value. */ + if (is_long_double == 1) + { + fpnum.ldbl = va_arg (ap, long double); + is_negative = fpnum.ldbl < 0; + if (is_negative) + fpnum.ldbl = -fpnum.ldbl; + } + else + { + fpnum.dbl = va_arg (ap, double); + is_negative = fpnum.dbl < 0; + if (is_negative) + fpnum.dbl = -fpnum.dbl; + } + + /* We now know the sign of the value and can determine the format. */ + if (is_negative) + { + sign_char = *_NL_CURRENT (LC_MONETARY, NEGATIVE_SIGN); + /* If the locale does not specify a character for the + negative sign we use a '-'. */ + if (sign_char == '\0') + sign_char = '-'; + cs_precedes = *_NL_CURRENT (LC_MONETARY, N_CS_PRECEDES); + sep_by_space = *_NL_CURRENT (LC_MONETARY, N_SEP_BY_SPACE); + /* If the '(' flag is not given use the sign position from + the current locale. */ + if (n_sign_posn == -1) + sign_posn = *_NL_CURRENT (LC_MONETARY, N_SIGN_POSN); + else + /* This means use parentheses. */ + sign_posn = 0; + } + else + { + sign_char = *_NL_CURRENT (LC_MONETARY, POSITIVE_SIGN); + /* If the locale does not specify a character for the + positive sign we use a <SP>. */ + if (sign_char == '\0') + sign_char = ' '; + cs_precedes = *_NL_CURRENT (LC_MONETARY, P_CS_PRECEDES); + sep_by_space = *_NL_CURRENT (LC_MONETARY, P_SEP_BY_SPACE); + if (n_sign_posn == -1) + sign_posn = *_NL_CURRENT (LC_MONETARY, P_SIGN_POSN); + else + /* Here we don't set SIGN_POSN to 0 because we don'want to + print <SP> instead of the braces and this is what the + value 5 means. */ + sign_posn = 5; + } + + /* Set default values for unspecified information. */ + if (cs_precedes != 0) + cs_precedes = 1; + if (sep_by_space == 127) + sep_by_space = 0; + if (left_prec == -1) + left_prec = 0; + + + /* Perhaps we'll someday make these things configurable so + better start using symbolic names now. */ +#define left_paren '(' +#define right_paren ')' + + startp = dest; /* Remember start so we can compute lenght. */ + + if (sign_posn == 0) + out_char (left_paren); + if (sign_posn == 5) /* This is for positive number and ( flag. */ + out_char (' '); + + if (cs_precedes) + { + if (sign_posn != 0 && sign_posn != 2 && sign_posn != 4 + && sign_posn != 5) + { + out_char (sign_char); + if (sep_by_space == 2) + out_char (' '); + } + + if (print_curr_symbol) + { + out_string (currency_symbol); + + if (sign_posn == 4) + { + if (sep_by_space == 2) + out_char (' '); + out_char (sign_char); + } + else + if (sep_by_space == 1) + out_char (' '); + } + } + else + if (sign_posn != 0 && sign_posn != 2 && sign_posn != 3 + && sign_posn != 4 && sign_posn != 5) + out_char (sign_char); + + /* Print the number. */ +#ifdef USE_IN_LIBIO + _IO_init ((_IO_FILE *) &f, 0); + _IO_JUMPS ((_IO_FILE *) &f) = &_IO_str_jumps; + _IO_str_init_static ((_IO_FILE *) &f, dest, (s + maxsize) - dest, dest); +#else + memset((PTR) &f, 0, sizeof(f)); + f.__magic = _IOMAGIC; + f.__mode.__write = 1; + /* The buffer size is one less than MAXLEN + so we have space for the null terminator. */ + f.__bufp = f.__buffer = (char *) dest; + f.__bufsize = (s + maxsize) - dest; + f.__put_limit = f.__buffer + f.__bufsize; + f.__get_limit = f.__buffer; + /* After the buffer is full (MAXLEN characters have been written), + any more characters written will go to the bit bucket. */ + f.__room_funcs = __default_room_functions; + f.__io_funcs.__write = NULL; + f.__seen = 1; +#endif + /* We clear the last available byte so we can find out whether + the numeric representation is too long. */ + s[maxsize - 1] = '\0'; + + info.prec = right_prec; + info.width = left_prec + (right_prec ? (right_prec + 1) : 0); + info.spec = 'f'; + info.is_long_double = is_long_double; + info.is_short = 0; + info.is_long = 0; + info.alt = 0; + info.space = 0; + info.left = left; + info.showsign = 0; + info.group = group; + info.pad = pad; + info.extra = 1; /* This means use values from LC_MONETARY. */ + + ptr = &fpnum; + done = __printf_fp ((FILE *) &f, &info, &ptr); + if (done < 0) + { + va_end (ap); + return -1; + } + + if (s[maxsize - 1] != '\0') + return -1; + + dest += done; + + if (!cs_precedes) + { + if (sign_posn == 3) + { + if (sep_by_space == 1) + out_char (' '); + out_char (sign_char); + } + + if (print_curr_symbol) + { + if (sign_posn == 3 && sep_by_space == 2) + out_char (' '); + out_string (currency_symbol); + } + } + else + if (sign_posn == 2) + { + if (sep_by_space == 2) + out_char (' '); + out_char (sign_char); + } + + if (sign_posn == 0) + out_char (right_paren); + if (sign_posn == 5) + out_char (' '); /* This is for positive number and ( flag. */ + + /* Now test whether the output width is filled. */ + if (dest - startp < width) + if (left) + /* We simply have to fill using spaces. */ + do + out_char (' '); + while (dest - startp < width); + else + { + int dist = width - (dest - startp); + char *cp; + for (cp = dest - 1; cp >= startp; --cp) + cp[dist] = cp[0]; + + dest += dist; + + do + startp[--dist] = ' '; + while (dist > 0); + } + } + + /* Terminate the string. */ + out_char ('\0'); + + va_end (ap); + + return dest - s - 1; +} |