2021-05-16 18:11:09 +02:00
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This file describes the implementation status and some notes; information is
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taken from the C99 standard (ISO/IEC 9899:1999), section 7 ("Library").
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2021-05-20 16:40:39 +02:00
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# Notes for implementers
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2021-05-16 18:11:09 +02:00
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7.1.2§6:
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Use (extern) in all function prototypes
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7.1.3§1:
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Only expose standard identifiers; anything else might be defined as a macro.
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Make sure every argument name, internal function name, etc. starts with
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either "__" or "_X" (where X is any uppercase letter)
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7.1.4§1:
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Always give a function even if there is a macro definition, so that the
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address of the function can be taken; don't rely on the macro being defined,
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as the user can remove it except in some special cases
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2021-05-23 14:30:35 +02:00
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String functions (mainly in <string.h>) can use 4-byte accesses, and in doing
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so read up to 3 bytes after the end of the string if it is not padded (which
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malloc'd strings and literal strings both are, leaving only stack-allocated and
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statically-allocated ones). This allows important speed optimizations. The
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extra access cannot trigger memory protection because there is no valid memory
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less than 4 bytes before the end of any protection region. The extra access
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might trigger the UBC in very specific scenarios, but we don't really care.
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2021-05-20 16:40:39 +02:00
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# Status
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2021-05-16 18:11:09 +02:00
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In this file, every definition is classified in one of several implementation
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statuses. There are 5 stages that every definition should go through.
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TODO: Function/symbol/macro is not implemented/defined
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BDEPS(...): Function/symbol/macro needs ... to build
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LDEPS(...): Function/symbol/macro needs ... to link
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TEST: Function/symbol/macro needs to be tested
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-: Function/symbol/macro is defined, builds, links, and is tested
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7.2 <assert.h>
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7.2.1 assert LDEPS(fprintf,stderr)
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7.3 <complex.h> => OpenLibm
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7.4 <ctype.h>
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7.4.1 is* -
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7.4.2 to* -
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7.5 <errno.h>
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7.5.2 EDOM, EILSEQ, ERANGE -
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7.6 <fenv.h> => OpenLibm
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7.7 <float.h> => GCC
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7.8 <inttypes.h>
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7.8.1 PRI* macros -
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7.8.1 SCN* macros -
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7.8.2.1 imaxabs -
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7.8.2.2 imaxdiv -
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7.8.2.3 strtoimax, strtoumax -
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7.8.2.4 wcstoimax, wcstoumax TODO
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7.9 <iso646.h> => GCC
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7.10 <limits.h> => GCC
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7.11 <locale.h>
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7.11.1 setlocale TEST
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7.11.2 localeconv TEST
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7.12 <math.h> => OpenLibm
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7.13 <setjmp.h>
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7.13.1 setjmp -
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7.13.2 longjmp -
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7.14 <signal.h>
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7.14.1.1 signal -
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7.14.1.2 raise -
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7.15 <stdarg.h> => GCC
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7.16 <stdbool.h> => GCC
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7.17 <stddef.h> => GCC
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7.18 <stdint.h> => GCC
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7.19 <stdio.h>
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7.19.1 Introduction TEST (no wide-oriented streams *)
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2022-01-01 17:11:04 +01:00
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7.19.4.1 remove TEST
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7.19.4.2 rename TODO
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7.19.4.3 tmpfile TODO
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7.19.4.4 tmpnam TODO
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7.19.5.1 fclose TEST
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7.19.5.2 fflush TEST
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7.19.5.3 fopen TEST
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(EXT) fdopen TEST
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7.19.5.4 freopen TODO
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7.19.5.5 setbuf TEST
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7.19.5.6 setvbuf TEST
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2022-01-01 17:11:04 +01:00
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7.19.6.1 fprintf LDEPS(fwrite)
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7.19.6.2 fscanf TODO
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7.19.6.3 printf LDEPS(fwrite, stdout)
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7.19.6.4 scanf TODO
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7.19.6.5 snprintf -
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7.19.6.6 sprintf -
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7.19.6.7 sscanf TODO
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7.19.6.8 vfprintf LDEPS(fwrite)
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7.19.6.9 vfscanf TODO
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7.19.6.10 vprintf LDEPS(fwrite, stdout)
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7.19.6.11 vscanf TODO
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7.19.6.12 vsnprintf -
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7.19.6.13 vsprintf -
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7.19.6.14 vsscanf TODO
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(EXT) asprintf -
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(EXT) vasprintf -
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(EXT) dprintf TEST
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(EXT) vdprintf TEST
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7.19.7.1 fgetc TODO
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7.19.7.2 fgets TODO
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7.19.7.3 fputc TODO
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7.19.7.4 fputs TODO
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7.19.7.5 getc TODO
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7.19.7.6 getchar TODO
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7.19.7.7 gets TODO
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7.19.7.8 putc TODO
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7.19.7.9 putchar TODO
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7.19.7.10 puts TODO
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7.19.7.11 ungetc TODO
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7.19.8.1 fread TODO
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7.19.8.2 fwrite TODO
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7.19.9.1 fgetpos TODO
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7.19.9.2 fseek TODO
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7.19.9.3 fsetpos TODO
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7.19.9.4 ftell TODO
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7.19.9.5 rewind TODO
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7.19.10.1 clearerr TODO
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7.19.10.2 feof TODO
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7.19.10.3 ferror TODO
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7.19.10.4 perror TODO
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7.20 <stdlib.h>
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7.20 MB_CUR_MAX TODO
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7.20.1.1 atof -
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7.20.1.2 atoi, atol, atoll -
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7.20.1.3 strtod, strtof, strtold -
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7.20.1.4 strtol, strtoul -
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7.20.1.4 strtoll, strtoull -
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7.20.2.1 rand -
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7.20.2.2 srand -
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7.20.3.1 calloc -
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7.20.3.2 free - (gint)
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7.20.3.3 malloc - (gint)
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7.20.3.4 realloc - (gint)
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7.20.4.1 abort - (stream flushing/closing/etc?)
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7.20.4.2 atexit TODO
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7.20.4.3 exit - (stream flushing/closing/etc?)
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7.20.4.4 _Exit - (gint)
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7.20.4.5 getenv TODO
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7.20.4.6 system TODO
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7.20.5.1 bsearch TODO
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7.20.5.2 qsort TEST
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7.20.6.1 abs, labs, llabs -
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7.20.6.2 div, ldiv, lldiv -
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7.20.7 Multibyte/wide char conv TODO
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7.20.8 Multibyte/wide string conv TODO
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7.21 <string.h>
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7.21.2.1 memcpy -
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7.21.2.2 memmove - (Unoptimized: byte-by-byte)
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7.21.2.3 strcpy -
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7.21.2.4 strncpy -
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7.21.3.1 strcat -
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7.21.3.2 strncat -
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7.21.4.1 memcmp -
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7.21.4.2 strcmp -
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7.21.4.3 strcoll -
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7.21.4.4 strncmp -
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7.21.4.5 strxfrm -
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7.21.5.1 memchr -
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7.21.5.2 strchr -
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7.21.5.3 strcspn -
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7.21.5.4 strpbrk -
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7.21.5.5 strrchr -
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7.21.5.6 strspn -
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7.21.5.7 strstr -
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7.21.5.8 strtok -
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7.21.6.1 memset -
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7.21.6.2 strerror -
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7.21.6.3 strlen -
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(EXT) strnlen -
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(EXT) strchrnul -
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(EXT) strcasestr -
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(EXT) strcasecmp -
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(EXT) strncasecmp -
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(EXT) strdup -
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(EXT) strndup -
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7.22 <tgmath.h> => GCC
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7.23 <time.h>
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7.23.2.1 clock -
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7.23.2.2 difftime -
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7.23.2.3 mktime - (DST flag ignored)
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7.23.2.4 time -
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7.23.3.1 asctime -
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7.23.3.2 ctime -
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7.23.3.3 gmtime -
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7.23.3.4 localtime - (No timezones; same as gmtime)
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7.23.3.5 strftime - (No %g, %G, %U, %V, %W, %z, %Z)
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7.24 <wchar.h> TODO (not a priority)
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7.25 <wctype.h> TODO (not a priority)
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# Supporting locales
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What if we wanted to support more locales?
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-> Need to a mechanism to supply the raw information, similar to the text files
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in /usr/share/i18n/locales
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-> Implement setlocale() and localeconv() properly (not hard)
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-> Probably support nl_langinfo(), which is much better than localeconv()
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-> Fix the "TODO: locale: ..." messages wherever assumptions on the locale are
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made in the code
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-> Properly implement strcoll() and strxfrm()
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2021-11-29 17:10:54 +01:00
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-> Add support in strftime()
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2021-06-13 17:26:32 +02:00
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# Supporting text and binary files (newline translation)
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2022-01-01 17:11:04 +01:00
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Because of 7.19.2§1.223 we don't need to support newline translation.
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2021-06-13 17:26:32 +02:00
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# Support wide-oriented streams
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This requires all the wide-char functions but also updating fpos_t to be a
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structure with at least some mbstate_t member (7.19.2§6).
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I really don't want to do that. Use multi-byte functions with UTF-8.
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2021-11-29 17:10:54 +01:00
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# Supporting timezones
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-> Update localtime()
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-> Add some timezone API
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