1 //===-- Format specifier converter for strftime -----------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_CONVERTER_H
10 #define LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_CONVERTER_H
11
12 #include "hdr/types/struct_tm.h"
13 #include "src/__support/macros/config.h"
14 #include "src/stdio/printf_core/writer.h"
15 #include "src/time/strftime_core/core_structs.h"
16
17 #include "composite_converter.h"
18 #include "num_converter.h"
19 #include "str_converter.h"
20
21 namespace LIBC_NAMESPACE_DECL {
22 namespace strftime_core {
23
24 // convert will call a conversion function to convert the FormatSection into
25 // its string representation, and then that will write the result to the
26 // writer.
27 template <printf_core::WriteMode write_mode>
convert(printf_core::Writer<write_mode> * writer,const FormatSection & to_conv,const tm * timeptr)28 int convert(printf_core::Writer<write_mode> *writer,
29 const FormatSection &to_conv, const tm *timeptr) {
30 // TODO: Implement the locale support.
31 // Currently locale flags are ignored, as described by the posix standard for
32 // the default locale.
33
34 if (!to_conv.has_conv)
35 return writer->write(to_conv.raw_string);
36 switch (to_conv.conv_name) {
37 // The cases are grouped by type, then alphabetized with lowercase before
38 // uppercase.
39
40 // raw conversions
41 case '%':
42 return writer->write("%");
43 case 'n':
44 return writer->write("\n");
45 case 't':
46 return writer->write("\t");
47
48 // numeric conversions
49 case 'C': // Century [00-99]
50 case 'd': // Day of the month [01-31]
51 case 'e': // Day of the month [1-31]
52 case 'g': // last 2 digits of ISO year [00-99]
53 case 'G': // ISO year
54 case 'H': // 24-hour format [00-23]
55 case 'I': // 12-hour format [01-12]
56 case 'j': // Day of the year [001-366]
57 case 'm': // Month of the year [01-12]
58 case 'M': // Minute of the hour [00-59]
59 case 's': // Seconds since the epoch
60 case 'S': // Second of the minute [00-60]
61 case 'u': // ISO day of the week ([1-7] starting Monday)
62 case 'U': // Week of the year ([00-53] week 1 starts on first *Sunday*)
63 case 'V': // ISO week number ([01-53], 01 is first week majority in this year)
64 case 'w': // Day of week ([0-6] starting Sunday)
65 case 'W': // Week of the year ([00-53] week 1 starts on first *Monday*)
66 case 'y': // Year of the Century [00-99]
67 case 'Y': // Full year
68 return convert_int(writer, to_conv, timeptr);
69
70 // string conversions
71 case 'a': // Abbreviated weekday name
72 case 'A': // Full weekday name
73 case 'b': // Abbreviated month name
74 case 'B': // Full month name
75 case 'h': // same as %b
76 case 'p': // AM/PM designation
77 return convert_str(writer, to_conv, timeptr);
78
79 // composite conversions
80 case 'c': // locale specified date and time
81 case 'D': // %m/%d/%y (month/day/year)
82 case 'F': // %Y-%m-%d (year-month-day)
83 case 'r': // %I:%M:%S %p (hour:minute:second AM/PM)
84 case 'R': // %H:%M (hour:minute)
85 case 'T': // %H:%M:%S (hour:minute:second)
86 case 'x': // locale specified date
87 case 'X': // locale specified time
88 return convert_composite(writer, to_conv, timeptr);
89
90 // timezone conversions
91 case 'z': // Timezone offset (+/-hhmm) (num conv)
92 case 'Z': // Timezone name (string conv)
93 // the standard says if no time zone is determinable, write no characters.
94 // Leave this here until time zones are implemented.
95 return 0;
96 default:
97 return writer->write(to_conv.raw_string);
98 }
99 return 0;
100 }
101
102 } // namespace strftime_core
103 } // namespace LIBC_NAMESPACE_DECL
104
105 #endif // LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_CONVERTER_H
106