c - 如何标记 c 中的整行输入？

Question

我需要从 cmd 中解析一行，看起来像这样

"SOME WHITE SPACE" "var_name" "SOME WHITE SPACE" "var_value" "SOME WHITE SPACE"

我用 fgets 整行:

fgets(input_buf,MAX_LINE_LENGTH,stdin);

并尝试像这样标记化:

sscanf(input_buf,"%s", var_buff);

sscanf(input_buf+strlen(var_buff),"%s", var_val_buff);

sscanf(input_buf+(strlen(var_buff)+strlen(var_val_buff)+2),"%s", rest_line_buff);

if (strlen(rest_line_buff) == 0)

    printf("error in usage\n");

我没有得到正确的值，因为空格的数量可能会有所不同。我如何标记输入行？

Answer 1

使用strtok ，如下面的示例程序所示:

#include <stdio.h>
#include <string.h>

int main ()
{
  char sampleInput[] ="foo bar foo1 bar1 foo2 bar2";
  char *token;
  char *whiteSpace = " \t\n\f\r\v";
  int isVariable = 1;

  token = strtok(sampleInput, whiteSpace);
  while (token != NULL)
  {
     if (isVariable) 
        printf("Variable = %s\n", token);
     else 
        printf("Value = %s\n\n", token);
     isVariable = isVariable ? 0 : 1;
     token = strtok(NULL, whiteSpace);
  }
  return 0;
}

输出:

Variable = foo
Value = bar

Variable = foo1
Value = bar1

Variable = foo2
Value = bar2