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[Breaking] Good news: GCC now checks your `my_snprintf` (direct) calls (`-Wformat` was on); Bad news: The build process no longer lets your incorrect formats/arguments sneak past (`-Werror` was also on). As such, this commit also migrates all direct `my_snprintf` calls from the old specifiers to MDEV-21978’s new `-Wformat`-compatible suffixes. The next commits will cover non-direct calls to `my_snprintf`. (I call them “`my_snprintf` descendants”.) This commit does not update the ABI records because there’re more ABI “changes” to come – half a dozen `include/mysql/plugin_*.h.pp`s are now missing the new `__attribute__`s.
124 lines
4.3 KiB
C
124 lines
4.3 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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@note
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The syntax of a format string is generally the same:
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%[<flag>][<length>][.<precision>][<size modifier>]<format>[<format extension>]
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where everything but the <format> is optional.
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Two 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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Both <length> and <precision> are the same as in the standard.
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They can be specified as integers, or as '*' to consume an int argument.
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<size modifier> can be 'l', 'll', or 'z'.
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Supported <format>s are 's' (null pointer is accepted, printed as "(null)"),
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'c', 'd', 'i', 'u', 'x', 'X', 'o', 'p' (works as "0x%x"), 'f', and 'g'.
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The '$n' syntax for positional arguments is supported.
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Format extensions:
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Format 'sQ'
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quotes the string with '`' (backtick)s similar to "`%s`",
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but also "escapes" existing '`'s in the string to '``' as in SQL ''''.
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Format 'sB'
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treats the argument as a byte sequence. It reads and prints exactly
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<precision> bytes without terminating on any '\0's in the sequence.
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The default <precision> when it's unspecified is not defined.
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Format 'sT'
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replaces the end of the printed string with "..." if it was truncated.
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Format 'sS'
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is a synonym for 's'. It's an escape that avoid
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consuming the following plain char as one of the above extension suffixes.
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Example: "Data Class: %sSType"
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Format 'iE'
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treats the argument as an errno number. It prints this number, a space,
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then its corresponding error message in double quotes. In other words:
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printf("%iE", n) === printf("%i \"%sT\"", n, strerror(n))
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Format 'dE' has no effect. Therefore, to escape '%iE', use '%dE' instead.
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Unrecognized and multiple suffixes are not parsed;
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for example, both "%sTQ" and "%iQ" will suffix with a literal 'Q'.
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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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#include <my_attribute.h>
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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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ATTRIBUTE_FORMAT_FPTR(printf, 3, 4);
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size_t (*my_vsnprintf_type)(char *, size_t, const char*, va_list)
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ATTRIBUTE_FORMAT_FPTR(printf, 3, 0);
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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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ATTRIBUTE_FORMAT(printf, 3, 4);
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size_t my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap)
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ATTRIBUTE_FORMAT(printf, 3, 0);
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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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