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+.. comment SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. COMMENT: COPYRIGHT (c) 1988-2002.
+.. COMMENT: On-Line Applications Research Corporation (OAR).
+.. COMMENT: All rights reserved.
+
+Services Provided by C Library (libc)
+#####################################
+
+Introduction
+============
+
+This section lists the routines that provided by the Newlib C Library.
+
+Standard Utility Functions (stdlib.h)
+=====================================
+
+- ``abort`` - Abnormal termination of a program
+
+- ``abs`` - Integer absolute value (magnitude)
+
+- ``assert`` - Macro for Debugging Diagnostics
+
+- ``atexit`` - Request execution of functions at program exit
+
+- ``atof`` - String to double or float
+
+- ``atoi`` - String to integer
+
+- ``bsearch`` - Binary search
+
+- ``calloc`` - Allocate space for arrays
+
+- ``div`` - Divide two integers
+
+- ``ecvtbuf`` - Double or float to string of digits
+
+- ``ecvt`` - Double or float to string of digits (malloc result)
+
+- ``__env_lock`` - Lock environment list for getenv and setenv
+
+- ``gvcvt`` - Format double or float as string
+
+- ``exit`` - End program execution
+
+- ``getenv`` - Look up environment variable
+
+- ``labs`` - Long integer absolute value (magnitude)
+
+- ``ldiv`` - Divide two long integers
+
+- ``malloc`` - Allocate memory
+
+- ``realloc`` - Reallocate memory
+
+- ``free`` - Free previously allocated memory
+
+- ``mallinfo`` - Get information about allocated memory
+
+- ``__malloc_lock`` - Lock memory pool for malloc and free
+
+- ``mbstowcs`` - Minimal multibyte string to wide string converter
+
+- ``mblen`` - Minimal multibyte length
+
+- ``mbtowc`` - Minimal multibyte to wide character converter
+
+- ``qsort`` - Sort an array
+
+- ``rand`` - Pseudo-random numbers
+
+- ``strtod`` - String to double or float
+
+- ``strtol`` - String to long
+
+- ``strtoul`` - String to unsigned long
+
+- ``system`` - Execute command string
+
+- ``wcstombs`` - Minimal wide string to multibyte string converter
+
+- ``wctomb`` - Minimal wide character to multibyte converter
+
+Character Type Macros and Functions (ctype.h)
+=============================================
+
+- ``isalnum`` - Alphanumeric character predicate
+
+- ``isalpha`` - Alphabetic character predicate
+
+- ``isascii`` - ASCII character predicate
+
+- ``iscntrl`` - Control character predicate
+
+- ``isdigit`` - Decimal digit predicate
+
+- ``islower`` - Lower-case character predicate
+
+- ``isprint`` - Printable character predicates (isprint, isgraph)
+
+- ``ispunct`` - Punctuation character predicate
+
+- ``isspace`` - Whitespace character predicate
+
+- ``isupper`` - Uppercase character predicate
+
+- ``isxdigit`` - Hexadecimal digit predicate
+
+- ``toascii`` - Force integers to ASCII range
+
+- ``tolower`` - Translate characters to lower case
+
+- ``toupper`` - Translate characters to upper case
+
+Input and Output (stdio.h)
+==========================
+
+- ``clearerr`` - Clear file or stream error indicator
+
+- ``fclose`` - Close a file
+
+- ``feof`` - Test for end of file
+
+- ``ferror`` - Test whether read/write error has occurred
+
+- ``fflush`` - Flush buffered file output
+
+- ``fgetc`` - Get a character from a file or stream
+
+- ``fgetpos`` - Record position in a stream or file
+
+- ``fgets`` - Get character string from a file or stream
+
+- ``fiprintf`` - Write formatted output to file (integer only)
+
+- ``fopen`` - Open a file
+
+- ``fdopen`` - Turn an open file into a stream
+
+- ``fputc`` - Write a character on a stream or file
+
+- ``fputs`` - Write a character string in a file or stream
+
+- ``fread`` - Read array elements from a file
+
+- ``freopen`` - Open a file using an existing file descriptor
+
+- ``fseek`` - Set file position
+
+- ``fsetpos`` - Restore position of a stream or file
+
+- ``ftell`` - Return position in a stream or file
+
+- ``fwrite`` - Write array elements from memory to a file or stream
+
+- ``getc`` - Get a character from a file or stream (macro)
+
+- ``getchar`` - Get a character from standard input (macro)
+
+- ``gets`` - Get character string from standard input (obsolete)
+
+- ``iprintf`` - Write formatted output (integer only)
+
+- ``mktemp`` - Generate unused file name
+
+- ``perror`` - Print an error message on standard error
+
+- ``putc`` - Write a character on a stream or file (macro)
+
+- ``putchar`` - Write a character on standard output (macro)
+
+- ``puts`` - Write a character string on standard output
+
+- ``remove`` - Delete a file's name
+
+- ``rename`` - Rename a file
+
+- ``rewind`` - Reinitialize a file or stream
+
+- ``setbuf`` - Specify full buffering for a file or stream
+
+- ``setvbuf`` - Specify buffering for a file or stream
+
+- ``siprintf`` - Write formatted output (integer only)
+
+- ``printf`` - Write formatted output
+
+- ``scanf`` - Scan and format input
+
+- ``tmpfile`` - Create a temporary file
+
+- ``tmpnam`` - Generate name for a temporary file
+
+- ``vprintf`` - Format variable argument list
+
+Strings and Memory (string.h)
+=============================
+
+- ``bcmp`` - Compare two memory areas
+
+- ``bcopy`` - Copy memory regions
+
+- ``bzero`` - Initialize memory to zero
+
+- ``index`` - Search for character in string
+
+- ``memchr`` - Find character in memory
+
+- ``memcmp`` - Compare two memory areas
+
+- ``memcpy`` - Copy memory regions
+
+- ``memmove`` - Move possibly overlapping memory
+
+- ``memset`` - Set an area of memory
+
+- ``rindex`` - Reverse search for character in string
+
+- ``strcasecmp`` - Compare strings ignoring case
+
+- ``strcat`` - Concatenate strings
+
+- ``strchr`` - Search for character in string
+
+- ``strcmp`` - Character string compare
+
+- ``strcoll`` - Locale specific character string compare
+
+- ``strcpy`` - Copy string
+
+- ``strcspn`` - Count chars not in string
+
+- ``strerror`` - Convert error number to string
+
+- ``strlen`` - Character string length
+
+- ``strlwr`` - Convert string to lower case
+
+- ``strncasecmp`` - Compare strings ignoring case
+
+- ``strncat`` - Concatenate strings
+
+- ``strncmp`` - Character string compare
+
+- ``strncpy`` - Counted copy string
+
+- ``strpbrk`` - Find chars in string
+
+- ``strrchr`` - Reverse search for character in string
+
+- ``strspn`` - Find initial match
+
+- ``strstr`` - Find string segment
+
+- ``strtok`` - Get next token from a string
+
+- ``strupr`` - Convert string to upper case
+
+- ``strxfrm`` - Transform string
+
+Signal Handling (signal.h)
+==========================
+
+- ``raise`` - Send a signal
+
+- ``signal`` - Specify handler subroutine for a signal
+
+Time Functions (time.h)
+=======================
+
+- ``asctime`` - Format time as string
+
+- ``clock`` - Cumulative processor time
+
+- ``ctime`` - Convert time to local and format as string
+
+- ``difftime`` - Subtract two times
+
+- ``gmtime`` - Convert time to UTC (GMT) traditional representation
+
+- ``localtime`` - Convert time to local representation
+
+- ``mktime`` - Convert time to arithmetic representation
+
+- ``strftime`` - Flexible calendar time formatter
+
+- ``time`` - Get current calendar time (as single number)
+
+Locale (locale.h)
+=================
+
+- ``setlocale`` - Select or query locale
+
+Reentrant Versions of Functions
+===============================
+
+- Equivalent for errno variable:
+ - ``errno_r`` - XXX
+
+- Locale functions:
+
+ - ``localeconv_r`` - XXX
+ - ``setlocale_r`` - XXX
+
+- Equivalents for stdio variables:
+
+ - ``stdin_r`` - XXX
+ - ``stdout_r`` - XXX
+ - ``stderr_r`` - XXX
+
+- Stdio functions:
+
+ - ``fdopen_r`` - XXX
+ - ``perror_r`` - XXX
+ - ``tempnam_r`` - XXX
+ - ``fopen_r`` - XXX
+ - ``putchar_r`` - XXX
+ - ``tmpnam_r`` - XXX
+ - ``getchar_r`` - XXX
+ - ``puts_r`` - XXX
+ - ``tmpfile_r`` - XXX
+ - ``gets_r`` - XXX
+ - ``remove_r`` - XXX
+ - ``vfprintf_r`` - XXX
+ - ``iprintf_r`` - XXX
+ - ``rename_r`` - XXX
+ - ``vsnprintf_r`` - XXX
+ - ``mkstemp_r`` - XXX
+ - ``snprintf_r`` - XXX
+ - ``vsprintf_r`` - XXX
+ - ``mktemp_t`` - XXX
+ - ``sprintf_r`` - XXX
+
+- Signal functions:
+
+ - ``init_signal_r`` - XXX
+ - ``signal_r`` - XXX
+ - ``kill_r`` - XXX
+ - ``_sigtramp_r`` - XXX
+ - ``raise_r`` - XXX
+
+- Stdlib functions:
+
+ - ``calloc_r`` - XXX
+ - ``mblen_r`` - XXX
+ - ``srand_r`` - XXX
+ - ``dtoa_r`` - XXX
+ - ``mbstowcs_r`` - XXX
+ - ``strtod_r`` - XXX
+ - ``free_r`` - XXX
+ - ``mbtowc_r`` - XXX
+ - ``strtol_r`` - XXX
+ - ``getenv_r`` - XXX
+ - ``memalign_r`` - XXX
+ - ``strtoul_r`` - XXX
+ - ``mallinfo_r`` - XXX
+ - ``mstats_r`` - XXX
+ - ``system_r`` - XXX
+ - ``malloc_r`` - XXX
+ - ``rand_r`` - XXX
+ - ``wcstombs_r`` - XXX
+ - ``malloc_r`` - XXX
+ - ``realloc_r`` - XXX
+ - ``wctomb_r`` - XXX
+ - ``malloc_stats_r`` - XXX
+ - ``setenv_r`` - XXX
+
+- String functions:
+
+ - ``strtok_r`` - XXX
+
+- System functions:
+
+ - ``close_r`` - XXX
+ - ``link_r`` - XXX
+ - ``unlink_r`` - XXX
+ - ``execve_r`` - XXX
+ - ``lseek_r`` - XXX
+ - ``wait_r`` - XXX
+ - ``fcntl_r`` - XXX
+ - ``open_r`` - XXX
+ - ``write_r`` - XXX
+ - ``fork_r`` - XXX
+ - ``read_r`` - XXX
+ - ``fstat_r`` - XXX
+ - ``sbrk_r`` - XXX
+ - ``gettimeofday_r`` - XXX
+ - ``stat_r`` - XXX
+ - ``getpid_r`` - XXX
+ - ``times_r`` - XXX
+
+- Time function:
+
+ - ``asctime_r`` - XXX
+
+Miscellaneous Macros and Functions
+==================================
+
+- ``unctrl`` - Return printable representation of a character
+
+Variable Argument Lists
+=======================
+
+- Stdarg (stdarg.h):
+
+ - ``va_start`` - XXX
+ - ``va_arg`` - XXX
+ - ``va_end`` - XXX
+
+- Vararg (varargs.h):
+
+ - ``va_alist`` - XXX
+ - ``va_start-trad`` - XXX
+ - ``va_arg-trad`` - XXX
+ - ``va_end-trad`` - XXX
+
+Reentrant System Calls
+======================
+
+- ``open_r`` - XXX
+
+- ``close_r`` - XXX
+
+- ``lseek_r`` - XXX
+
+- ``read_r`` - XXX
+
+- ``write_r`` - XXX
+
+- ``fork_r`` - XXX
+
+- ``wait_r`` - XXX
+
+- ``stat_r`` - XXX
+
+- ``fstat_r`` - XXX
+
+- ``link_r`` - XXX
+
+- ``unlink_r`` - XXX
+
+- ``sbrk_r`` - XXX