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int unlink(const char *fname)
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The prototype to unlink( ) is found in <dosh> The unlink( ) function is part of the UNIX-like I/O system and is not defined by the ANSI/ISO C/C++ standard The unlink( ) function removes the specified file from the directory It returns 0 on success and 1 on failure and sets errno to one of the following values:
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Example
This program deletes the file specified as the first command-line argument:
#include <stdioh> #include <dosh> int main(int argc, char *argv[]) { if(unlink(argv[1])==-1) printf("Cannot remove file"); return 0; }
Related Functions
open( ), close( )
int unlock(int handle, long offset, long length)
Description
The prototype for unlock( ) is found <ioh> The unlock( ) function is not defined by the ANSI/ISO C/C++ standard It is used to unlock a portion of a locked file, thus allowing another program to use it until a new
11:
I/O Functions
lock is placed on the file To lock a file, use lock( ) These functions provide control for file sharing in network environments The file to be unlocked is associated with handle The portion of the file to be unlocked is determined by the starting offset from the beginning of the file and the length If unlock( ) is successful, 0 is returned If it is unsuccessful, 1 is returned
Example
This fragment unlocks the first 128 bytes of the file associated with fd:
THE C++ BUILDER FUNCTION LIBRARY unlock(fd, 0, 128);
Related Functions
lock( ), sopen( )
int vprintf(const char *format, va_list arg_ptr) int vfprintf(FILE *stream, const char *format, va_list arg_ptr) int vsprintf(char *buf, const char *format, va_list arg_ptr)
Description
The prototypes for these functions require the files <stdioh> and <stdargh> The functions vprintf( ), vfprintf( ), and vsprintf( ) are functionally equivalent to printf( ), fprintf( ), and sprintf( ), respectively, except that the argument list has been replaced by a pointer to a list of arguments This pointer must be of type va_list, which is defined in <stdargh> See the proper related function Also see va_arg( ), va_start( ), and va_end( ) in 19 for further information
Example
This fragment shows how to set up a call to vprintf( ) The call to va_start( ) creates a variable-length argument pointer to the start of the argument list This pointer must be used in the call to vprintf( ) The call to va_end( ) clears the variable-length argument pointer
#include <stdioh> #include <stdargh>
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void print_message(char *, ); int main(void) { print_message("Cannot open file %s","test"); return 0; } void print_message( char *format, ) { va_list ptr; /* get an arg ptr */ /* initialize ptr to point to the first argument after the format string */ va_start(ptr, format); /* print out message */ vprintf(format, ptr); va_end(ptr); }
Related Functions
va_list( ), va_start( ), va_end( )
int vscanf(const char *format, va_list arg_ptr) int vfscanf(FILE *stream, const char *format, va_list arg_ptr) int vsscanf(const char *buf, const char *format, va_list arg_ptr)
Description
The prototypes for these functions require the files <stdioh> and <stdargh> The functions vscanf( ), vfscanf( ), and vsscanf( ) are functionally equivalent to scanf( ), fscanf( ), and sscanf( ), respectively, except that the argument list has been
11:
I/O Functions
replaced by a pointer to a list of arguments This pointer must be of type va_list, which is defined in <stdargh> See the proper related function Also see va_arg( ), va_start( ), and va_end( ) in 19 for further information
Example
This fragment shows how to set up a call to vscanf( ) The program reads two integers entered by the user The call to va_start( ) creates a variable-length argument pointer to the start of the argument list It is this pointer that must be used in the call to vscanf( ) The call to va_end( ) clears the variable-length argument pointer
THE C++ BUILDER FUNCTION LIBRARY #include <stdioh> #include <stdargh> void read_int(int num, ); int main(void) { int a, b; read_int(2, &a, &b); printf("%d %d", a, b); return 0; } void read_int(int num, ) { va_list ptr; /* get an arg ptr */ /* initialize ptr to point to the first argument after the format string */ va_start(ptr, num); printf("Enter %d integers: ", num); /* read ints */ vscanf("%d %d", ptr); va_end(ptr); }
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