f009f72df5
This patch adds the %m conversion to printf, which prints the strerror(errno). Explanation of why is below, this patch also updates the docs, tests, and build system to accomodate this. The standard for syslog in posix specifies it uses the same format as printf, but adds %m which prints the error message string for the current value of errno. For ease of implementation, it's standard practice for libc implementers to just add %m to printf instead of creating a separate parser for syslog.
106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
//===-- Format specifier converter implmentation for printf -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/stdio/printf_core/converter.h"
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#include "src/__support/macros/config.h"
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#include "src/stdio/printf_core/core_structs.h"
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#include "src/stdio/printf_core/printf_config.h"
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#include "src/stdio/printf_core/strerror_converter.h"
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#include "src/stdio/printf_core/writer.h"
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// This option allows for replacing all of the conversion functions with custom
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// replacements. This allows conversions to be replaced at compile time.
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#ifndef LIBC_COPT_PRINTF_CONV_ATLAS
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#include "src/stdio/printf_core/converter_atlas.h"
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#else
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#include LIBC_COPT_PRINTF_CONV_ATLAS
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#endif
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#include <stddef.h>
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namespace LIBC_NAMESPACE_DECL {
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namespace printf_core {
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int convert(Writer *writer, const FormatSection &to_conv) {
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if (!to_conv.has_conv)
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return writer->write(to_conv.raw_string);
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#if !defined(LIBC_COPT_PRINTF_DISABLE_FLOAT) && \
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defined(LIBC_COPT_PRINTF_HEX_LONG_DOUBLE)
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if (to_conv.length_modifier == LengthModifier::L) {
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switch (to_conv.conv_name) {
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case 'f':
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case 'F':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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return convert_float_hex_exp(writer, to_conv);
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default:
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break;
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}
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}
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#endif // LIBC_COPT_PRINTF_DISABLE_FLOAT
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switch (to_conv.conv_name) {
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case '%':
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return writer->write("%");
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case 'c':
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return convert_char(writer, to_conv);
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case 's':
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return convert_string(writer, to_conv);
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case 'd':
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case 'i':
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case 'u':
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case 'o':
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case 'x':
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case 'X':
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case 'b':
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case 'B':
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return convert_int(writer, to_conv);
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#ifndef LIBC_COPT_PRINTF_DISABLE_FLOAT
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case 'f':
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case 'F':
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return convert_float_decimal(writer, to_conv);
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case 'e':
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case 'E':
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return convert_float_dec_exp(writer, to_conv);
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case 'a':
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case 'A':
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return convert_float_hex_exp(writer, to_conv);
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case 'g':
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case 'G':
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return convert_float_dec_auto(writer, to_conv);
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#endif // LIBC_COPT_PRINTF_DISABLE_FLOAT
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#ifdef LIBC_INTERNAL_PRINTF_HAS_FIXED_POINT
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case 'r':
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case 'R':
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case 'k':
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case 'K':
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return convert_fixed(writer, to_conv);
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#endif // LIBC_INTERNAL_PRINTF_HAS_FIXED_POINT
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#ifndef LIBC_COPT_PRINTF_DISABLE_STRERROR
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case 'm':
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return convert_strerror(writer, to_conv);
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#endif // LIBC_COPT_PRINTF_DISABLE_STRERROR
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#ifndef LIBC_COPT_PRINTF_DISABLE_WRITE_INT
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case 'n':
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return convert_write_int(writer, to_conv);
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#endif // LIBC_COPT_PRINTF_DISABLE_WRITE_INT
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case 'p':
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return convert_pointer(writer, to_conv);
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default:
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return writer->write(to_conv.raw_string);
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}
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return -1;
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}
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} // namespace printf_core
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} // namespace LIBC_NAMESPACE_DECL
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