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Keil Software — C51 Compiler User’s Guide	309

Appendix A. Differences from ANSI C

The C51 compiler differs in only a few aspects from the ANSI C Standard. These differences can be grouped into compiler-related differences and library-related differences.

Compiler-related Differences

!Wide Characters

Wide 16-bit characters are not supported by C51. ANSI provides wide characters for future support of an international character set.

!Recursive Function Calls

Recursive function calls are not supported by default. Functions that are recursive must be declared using the reentrant function attribute. Reentrant functions can be called recursively because the local data and parameters are stored in a reentrant stack. In comparison, functions which are not declared using the reentrant attribute use static memory segments for the local data of the function. A recursive call to these functions overwrites the local data of the prior function call instance.

Library-related Differences

The ANSI C Standard Library includes a vast number of routines, most of which are included in C51. Many, however, are not applicable to an embedded application and are excluded from the C51 library.

The following ANSI Standard library routines are included in the C51 library:

abs	cosh	isgraph
acos	exp	islower
asin	fabs	isprint
atan	floor	ispunct
atan2	free	isspace
atof	getchar	isupper
atoi	gets	isxdigit
atol	isalnum	labs
calloc	isalpha	log
ceil	iscntrl	log10
cos	isdigit	longjmp

	310		Appendix A. Differences from ANSI C

	malloc	setjmp	strncmp
	memchr	sin	strncpy
	memchr	sin	strncpy
A	memcmp	sinh	strpbrk
A	memcpy	sprintf	strrchr
	memcpy	sprintf	strrchr
	memmove	sqrt	strspn
	memset	srand	tan
	memset	srand	tan
	modf	sscanf	tanh
	pow	strcat	tolower
	printf	strchr	toupper
	putchar	strcmp	va_arg
	puts	strcpy	va_end
	rand	strcspn	va_start
	realloc	strlen	vprintf
	scanf	strncat	vsprintf
	The following ANSI Standard library routines are not included in the C51
	library:
	abort	freopen	rename
	asctime	frexp	rewind
	atexit	fscanf	setbuf
	bsearch	fseek	setlocale
	clearerr	fsetpos	setvbuf
	clock	ftell	signal
	ctime	fwrite	strcoll
	difftime	getc	strerror
	div	getenv	strftime
	exit	gmtime	strstr
	fclose	ldexp	strtod
	feof	ldiv	strtok
	ferror	localeconv	strtol
	fflush	localtime	strtoul
	fgetc	mblen	strxfrm
	fgetpos	mbstowcs	system
	fgets	mbtowc	time
	fmod	mktime	tmpfile
	fopen	perror	tmpnam
	fprintf	putc	ungetc
	fputc	qsort	vfprintf
	fputs	raise	wcstombs
	fread	remove	wctomb

Keil Software — C51 Compiler User’s Guide	311

The following routines are not found in the ANSI Standard Library but are included in the C51 library.

acos517	_irol_	sqrt517
asin517	_iror_	sscanf517
atan517	log10517	strpos
atof517	log517	strrpbrk
cabs	_lrol_	strrpos
_chkfloat_	_lror_	tan517
cos517	memccpy	_testbit_
_crol_	_nop_	toascii
_cror_	printf517	toint
exp517	scanf517	_tolower
_getkey	sin517	_toupper
init_mempool	sprintf517	ungetchar

312	Appendix A. Differences from ANSI C

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