diff options
Diffstat (limited to 'man3head/printf.h.3head')
| -rw-r--r-- | man3head/printf.h.3head | 121 |
1 files changed, 61 insertions, 60 deletions
diff --git a/man3head/printf.h.3head b/man3head/printf.h.3head index 934b222e5..1c6ad32cb 100644 --- a/man3head/printf.h.3head +++ b/man3head/printf.h.3head @@ -2,7 +2,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH printf.h 3head 2022-09-18 "Linux man-pages 6.03" +.TH printf.h 3head 2022-09-18 "Linux man-pages 6.05.01" .SH NAME printf.h, \%register_printf_specifier, @@ -159,14 +159,15 @@ The type is determined by using one of the following constants: cast to .IR char . .TP -.B PA_WCHAR wchar_t +.B PA_WCHAR +.IR wchar_t . .TP .B PA_STRING -.I "const char\~*" , +.IR "const char\~*" , a \(aq\e0\(aq-terminated string. .TP .B PA_WSTRING -.I "const wchar_t\~*" , +.IR "const wchar_t\~*" , a wide character L\(aq\e0\(aq-terminated string. .TP .B PA_POINTER @@ -220,7 +221,9 @@ On error, it should return \-1. .TP .B EINVAL The specifier was not a valid character. -.SH VERSIONS +.SH STANDARDS +GNU. +.SH HISTORY .BR \%register_printf_function (3) is an older function similar to .BR \%register_printf_specifier (), @@ -230,8 +233,6 @@ That function can't handle user-defined types. .BR \%register_printf_specifier () superseeds .BR \%register_printf_function (3). -.SH STANDARDS -These nonstandard functions are present in glibc. .SH EXAMPLES The following example program registers the 'b' and 'B' specifiers to print integers in binary format, @@ -241,7 +242,7 @@ This can be used to print in binary prior to C23. .\" SRC BEGIN (register_printf_specifier.c) .EX /* This code is in the public domain */ - +\& #include <err.h> #include <limits.h> #include <stddef.h> @@ -250,21 +251,21 @@ This can be used to print in binary prior to C23. #include <stdlib.h> #include <string.h> #include <sys/param.h> - +\& #include <printf.h> - +\& #define GROUP_SEP \[aq]\e\[aq]\[aq] - +\& struct Printf_Pad { char ch; size_t len; }; - +\& static int b_printf(FILE *stream, const struct printf_info *info, const void *const args[]); static int b_arginf_sz(const struct printf_info *info, size_t n, int argtypes[n], int size[n]); - +\& static uintmax_t b_value(const struct printf_info *info, const void *arg); static size_t b_bin_repr(char bin[UINTMAX_WIDTH], @@ -283,15 +284,15 @@ static ssize_t b_print_number(FILE *stream, size_t min_len, size_t bin_len); static char pad_ch(const struct printf_info *info); static ssize_t pad_spaces(FILE *stream, size_t pad_len); - +\& int main(void) { - if (register_printf_specifier(\[aq]b\[aq], b_printf, b_arginf_sz) == -1) + if (register_printf_specifier(\[aq]b\[aq], b_printf, b_arginf_sz) == \-1) err(EXIT_FAILURE, "register_printf_specifier(\[aq]b\[aq], ...)"); - if (register_printf_specifier(\[aq]B\[aq], b_printf, b_arginf_sz) == -1) + if (register_printf_specifier(\[aq]B\[aq], b_printf, b_arginf_sz) == \-1) err(EXIT_FAILURE, "register_printf_specifier(\[aq]B\[aq], ...)"); - +\& printf("....----....----....----....----\en"); printf("%llb;\en", 0x5Ellu); printf("%lB;\en", 0x5Elu); @@ -341,10 +342,10 @@ main(void) printf("%019B;\en", 0xAB); printf("%#016b;\en", 0xAB); printf("....----....----....----....----\en"); - +\& return 0; } - +\& static int b_printf(FILE *stream, const struct printf_info *info, const void *const args[]) @@ -353,16 +354,16 @@ b_printf(FILE *stream, const struct printf_info *info, size_t min_len, bin_len; ssize_t len, tmp; struct Printf_Pad pad = {0}; - +\& len = 0; - +\& min_len = b_bin_repr(bin, info, args[0]); bin_len = b_bin_len(info, min_len); - +\& pad.ch = pad_ch(info); if (pad.ch == \[aq] \[aq]) pad.len = b_pad_len(info, bin_len); - +\& /* Padding with \[aq] \[aq] (right aligned) */ if ((pad.ch == \[aq] \[aq]) && !info->left) { tmp = pad_spaces(stream, pad.len); @@ -370,7 +371,7 @@ b_printf(FILE *stream, const struct printf_info *info, return EOF; len += tmp; } - +\& /* "0b"/"0B" prefix */ if (info->alt) { tmp = b_print_prefix(stream, info); @@ -378,7 +379,7 @@ b_printf(FILE *stream, const struct printf_info *info, return EOF; len += tmp; } - +\& /* Padding with \[aq]0\[aq] */ if (pad.ch == \[aq]0\[aq]) { tmp = b_pad_zeros(stream, info, min_len); @@ -386,13 +387,13 @@ b_printf(FILE *stream, const struct printf_info *info, return EOF; len += tmp; } - +\& /* Print number (including leading 0s to fill precision) */ tmp = b_print_number(stream, info, bin, min_len, bin_len); if (tmp == EOF) return EOF; len += tmp; - +\& /* Padding with \[aq] \[aq] (left aligned) */ if (info\->left) { tmp = pad_spaces(stream, pad.len); @@ -400,27 +401,27 @@ b_printf(FILE *stream, const struct printf_info *info, return EOF; len += tmp; } - +\& return len; } - +\& static int b_arginf_sz(const struct printf_info *info, size_t n, int argtypes[n], [[maybe_unused]] int size[n]) { if (n < 1) - return -1; - + return \-1; +\& if (info\->is_long_double) argtypes[0] = PA_INT | PA_FLAG_LONG_LONG; else if (info\->is_long) argtypes[0] = PA_INT | PA_FLAG_LONG; else argtypes[0] = PA_INT; - +\& return 1; } - +\& static uintmax_t b_value(const struct printf_info *info, const void *arg) { @@ -428,54 +429,54 @@ b_value(const struct printf_info *info, const void *arg) return *(const unsigned long long *)arg; if (info\->is_long) return *(const unsigned long *)arg; - +\& /* short and char are both promoted to int */ return *(const unsigned int *)arg; } - +\& static size_t b_bin_repr(char bin[UINTMAX_WIDTH], const struct printf_info *info, const void *arg) { size_t min_len; uintmax_t val; - +\& val = b_value(info, arg); - +\& bin[0] = \[aq]0\[aq]; for (min_len = 0; val; min_len++) { bin[min_len] = \[aq]0\[aq] + (val % 2); val >>= 1; } - +\& return MAX(min_len, 1); } - +\& static size_t b_bin_len(const struct printf_info *info, ptrdiff_t min_len) { return MAX(info\->prec, min_len); } - +\& static size_t b_pad_len(const struct printf_info *info, ptrdiff_t bin_len) { ptrdiff_t pad_len; - +\& pad_len = info\->width \- bin_len; if (info\->alt) pad_len \-= 2; if (info\->group) pad_len \-= (bin_len \- 1) / 4; - +\& return MAX(pad_len, 0); } - +\& static ssize_t b_print_prefix(FILE *stream, const struct printf_info *info) { ssize_t len; - +\& len = 0; if (fputc(\[aq]0\[aq], stream) == EOF) return EOF; @@ -483,17 +484,17 @@ b_print_prefix(FILE *stream, const struct printf_info *info) if (fputc(info\->spec, stream) == EOF) return EOF; len++; - +\& return len; } - +\& static ssize_t b_pad_zeros(FILE *stream, const struct printf_info *info, ptrdiff_t min_len) { ssize_t len; ptrdiff_t tmp; - +\& len = 0; tmp = info\->width \- (info\->alt * 2); if (info\->group) @@ -502,55 +503,55 @@ b_pad_zeros(FILE *stream, const struct printf_info *info, if (fputc(\[aq]0\[aq], stream) == EOF) return EOF; len++; - +\& if (!info\->group || (i % 4)) continue; if (fputc(GROUP_SEP, stream) == EOF) return EOF; len++; } - +\& return len; } - +\& static ssize_t b_print_number(FILE *stream, const struct printf_info *info, const char bin[UINTMAX_WIDTH], size_t min_len, size_t bin_len) { ssize_t len; - +\& len = 0; - +\& /* Print leading zeros to fill precision */ for (size_t i = bin_len \- 1; i > min_len \- 1; i\-\-) { if (fputc(\[aq]0\[aq], stream) == EOF) return EOF; len++; - +\& if (!info\->group || (i % 4)) continue; if (fputc(GROUP_SEP, stream) == EOF) return EOF; len++; } - +\& /* Print number */ for (size_t i = min_len \- 1; i < min_len; i\-\-) { if (fputc(bin[i], stream) == EOF) return EOF; len++; - +\& if (!info\->group || (i % 4) || !i) continue; if (fputc(GROUP_SEP, stream) == EOF) return EOF; len++; } - +\& return len; } - +\& static char pad_ch(const struct printf_info *info) { @@ -558,19 +559,19 @@ pad_ch(const struct printf_info *info) return \[aq] \[aq]; return \[aq]0\[aq]; } - +\& static ssize_t pad_spaces(FILE *stream, size_t pad_len) { ssize_t len; - +\& len = 0; for (size_t i = pad_len - 1; i < pad_len; i\-\-) { if (fputc(\[aq] \[aq], stream) == EOF) return EOF; len++; } - +\& return len; } .EE |