4.59 siscanf, fiscanf, iscanf—scan and format non-floating input

Synopsis

     #include <stdio.h>
     
     int iscanf(const char *format, ...);
     int fiscanf(FILE *fd, const char *format, ...);
     int siscanf(const char *str, const char *format, ...);
     
     int _iscanf_r(struct _reent *ptr, const char *format, ...);
     int _fiscanf_r(struct _reent *ptr, FILE *fd,
         const char *format, ...);
     int _siscanf_r(struct _reent *ptr, const char *str,
         const char *format, ...);
     

Description
iscanf, fiscanf, and siscanf are the same as scanf, fscanf, and sscanf respectively, only that they restrict the available formats to non-floating-point format specifiers.

The routines _iscanf_r, _fiscanf_r, and _siscanf_r are reentrant versions of iscanf, fiscanf, and siscanf that take an additional first argument pointing to a reentrancy structure.

Returns
iscanf returns the number of input fields successfully scanned, converted and stored; the return value does not include scanned fields which were not stored.

If iscanf attempts to read at end-of-file, the return value is EOF.

If no fields were stored, the return value is 0.

Portability
iscanf, fiscanf, and siscanf are newlib extensions.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.