C语言函数大全(p开头)

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函数名: parsfnm

功能: 分析文件名

用法: char *parsfnm (char *cmdline, struct fcb *fcbptr, int option);

程序例:

#include

#include

#include

#include

int main(void)

{

char line[80];

struct fcb blk;

/* get file name */

printf("Enter drive and file name (no path - ie. a:file.dat)\n");

gets(line);

/* put file name in fcb */

if (parsfnm(line, &blk, 1) == NULL)

printf("Error in parsfm call\n");

else

printf("Drive #%d Name: %11s\n", blk.fcb_drive, blk.fcb_name);

return 0;

}

函数名: peek

功能: 检查存储单元

用法: int peek(int segment, unsigned offset);

程序例:

#include

#include

#include

int main(void)

{

int value = 0;

printf("The current status of your keyboard is:\n");

value = peek(0x0040, 0x0017);

if (value & 1)

printf("Right shift on\n");

else

printf("Right shift off\n");

if (value & 2)

printf("Left shift on\n");

else

printf("Left shift off\n");

if (value & 4)

printf("Control key on\n");

else

printf("Control key off\n");

if (value & 8)

printf("Alt key on\n");

else

printf("Alt key off\n");

if (value & 16)

printf("Scroll lock on\n");

else

printf("Scroll lock off\n");

if (value & 32)

printf("Num lock on\n");

else

printf("Num lock off\n");

if (value & 64)

printf("Caps lock on\n");

else

printf("Caps lock off\n");

return 0;