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111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
#ifndef MYSQL_SERVICE_MY_SNPRINTF_INCLUDED
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/* Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/**
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@file
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my_snprintf service
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Portable and limited vsnprintf() implementation.
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This is a portable, limited vsnprintf() implementation, with some
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extra features. "Portable" means that it'll produce identical result
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on all platforms (for example, on Windows and Linux system printf %e
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formats the exponent differently, on different systems %p either
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prints leading 0x or not, %s may accept null pointer or crash on
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it). "Limited" means that it does not support all the C89 features.
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But it supports few extensions, not in any standard.
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my_vsnprintf(to, n, fmt, ap)
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@param[out] to A buffer to store the result in
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@param[in] n Store up to n-1 characters, followed by an end 0
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@param[in] fmt printf-like format string
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@param[in] ap Arguments
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@return a number of bytes written to a buffer *excluding* terminating '\0'
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@post
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The syntax of a format string is generally the same:
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% <flag> <width> <precision> <length modifier> <format>
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where everything but the format is optional.
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Three one-character flags are recognized:
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'0' has the standard zero-padding semantics;
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'-' is parsed, but silently ignored;
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'`' (backtick) is only supported for strings (%s) and means that the
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string will be quoted according to MySQL identifier quoting rules.
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Both <width> and <precision> can be specified as numbers or '*'.
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If an asterisk is used, an argument of type int is consumed.
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<length modifier> can be 'l', 'll', or 'z'.
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Supported formats are 's' (null pointer is accepted, printed as
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"(null)"), 'b' (extension, see below), 'c', 'd', 'i', 'u', 'x', 'o',
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'X', 'p' (works as 0x%x), 'f', 'g', 'M' (extension, see below),
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'T' (extension, see below).
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Standard syntax for positional arguments $n is supported.
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Extensions:
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Flag '`' (backtick): see above.
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Format 'b': binary buffer, prints exactly <precision> bytes from the
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argument, without stopping at '\0'.
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Format 'M': takes one integer, prints this integer, space, double quote
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error message, double quote. In other words
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printf("%M", n) === printf("%d \"%s\"", n, strerror(n))
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Format 'T': takes string and print it like s but if the strints should be
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truncated puts "..." at the end.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef MYSQL_ABI_CHECK
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#include <stdarg.h>
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#include <stdlib.h>
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#endif
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extern struct my_snprintf_service_st {
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size_t (*my_snprintf_type)(char*, size_t, const char*, ...);
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size_t (*my_vsnprintf_type)(char *, size_t, const char*, va_list);
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} *my_snprintf_service;
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#ifdef MYSQL_DYNAMIC_PLUGIN
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#define my_vsnprintf my_snprintf_service->my_vsnprintf_type
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#define my_snprintf my_snprintf_service->my_snprintf_type
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#else
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size_t my_snprintf(char* to, size_t n, const char* fmt, ...);
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size_t my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#define MYSQL_SERVICE_MY_SNPRINTF_INCLUDED
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#endif
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