CrossWorks for ARM User Guide

DescriptionPortabilitysscanf reads input from the string s under control of the string pointed to by formatthat specifies the admissible input sequences and how they are to be converted forassignment, using subsequent arguments as pointers to the objects to receive theconverted input.If there are insufficient arguments for the format, the behavior is undefined. If theformat is exhausted while arguments remain, the excess arguments are evaluated butare otherwise ignored.sscanf returns the value of the macro EOF if an input failure occurs before anyconversion. Otherwise, sscanf returns the number of input items assigned, which canbe fewer than provided for, or even zero, in the event of an early matching failure.sscanf conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).See Also Formatted input control strings (page 285)vprintfSynopsisDescriptionNotesPortability#include int vprintf(const char *format, va_list arg);vprintf writes to the standard output stream using putchar, under control of the stringpointed to by format that specifies how subsequent arguments are converted foroutput. Before calling vprintf, arg must be initialized by the va_start macro (andpossibly subsequent va_arg calls). vprintf does not invoke the va_end macro.vprintf returns number of characters transmitted, or a negative value if an output orencoding error occurred.vprintf is equivalent to printf with the variable argument list replaced by arg.vprintf conforms to ISO/IEC 9899:1999 (C99).See Also Formatted output control strings (page 281)vscanfSynopsisDescription#include int vscanf(const char *format, va_list arg);vscanf reads input from the standard input stream under control of the string pointedto by format that specifies the admissible input sequences and how they are to beconverted for assignment, using subsequent arguments as pointers to the objects toreceive the converted input. Before calling vscanf, arg must be initialized by theva_start macro (and possibly subsequent va_arg calls). vscanf does not invoke theva_end macro.If there are insufficient arguments for the format, the behavior is undefined.292 Chapter 28 Standard C Library Reference