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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference 
Appendix A. ANSI C Implementation 
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 6.0 Differences Version 5.0 Differences Version 4.0 Differences Version 3.4 Differences Version 3.2 Differences Version 3.0 Differences Version 2.0 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Unsigned Types Local Variables Other Sources D. Compiler Limits E. Byte Ordering F. Hints, Tips, and Techniques Recursive Code References Problems Using printf Uncalled Functions Using Monitor-51 Trouble with bdata Function PointersLibrary-Related
The ANSI C Standard Library includes a vast number of routines, most of which are included in the Cx51 Library. Many, however, are not applicable to an embedded application and are excluded from the Cx51 Library.
The following ANSI Standard Library routines are included in the Cx51 Compiler library:
The following ANSI Standard library routines are not included in the C51 library:
| abort asctime atexit bsearch clearerr clock ctime difftime div exit fclose feof ferror fflush fgetc fgetpos | fgets fopen fprintf fputc fputs fread freopen frexp fscanf fseek fsetpos ftell fwrite getc getenv gmtime | ldexp ldiv localeconv localtime mblen mbstowcs mbtowc mktime perror putc qsort raise remove rename rewind setbuf | setlocale setvbuf signal strcoll strerror strftime strxfrm system time tmpfile tmpnam ungetc vfprintf wcstombs wctomb |
The following routines are not found in the ANSI Standard Library but are included in the C51 library:
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