[英]Trying to use strtok() for a shell function in C
I am trying to tokenize the user inputed commands for a shell program.我正在尝试为 shell 程序标记用户输入的命令。 The program runs but I don't think that it is filling the param array I have declared.该程序运行,但我认为它没有填充我声明的 param 数组。 I'm sorry if it seems that I don't have a ton of information as I am learning this as a do it, but I am not sure why it isn't filling param.我很抱歉,如果我在学习时似乎没有大量信息,我很抱歉,但我不确定为什么它没有填充参数。 Any help would be grateful and if you need any additional information please feel free to ask.任何帮助将不胜感激,如果您需要任何其他信息,请随时询问。
#include "HeaderFile.h"
#include <stdio.h>
#include <stdlib.h>
#define token_delimiter " \n\r"
char **shell_read(char *line, char **param){
line = NULL;
ssize_t size = 0;
getline(&line, &size, stdin);
//printf("%s", line);
int i = 0;
char *line_token;
line_token = strtok(line, token_delimiter);
printf("%s", line_token);
for(i=1; line_token!=NULL; i++){
param[i] = line_token;
line_token = strtok(NULL, token_delimiter);
}
param[0] = NULL;
return(param);
}
something like this:像这样:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define token_delimiter " \n\r"
char **shell_read(void){//Parameters are not necessary. because they are made in this function.
char *line = NULL;
size_t size = 0;
ssize_t len;
if(-1 == (len = getline(&line, &size, stdin))){
free(line);
return NULL;
}
char **param = malloc(sizeof(*param) * ((len + 1)/2 + 1));//last +1 for NULL
int i = 0;
char *line_token = strtok(line, token_delimiter);
while(line_token != NULL){
param[i++] = strdup(line_token);//need allocate and copy
line_token = strtok(NULL, token_delimiter);
}
param[i] = NULL;
free(line);
return param;
}
int main(void){
putchar('>');fflush(stdout);
char **tokens = shell_read();
if(tokens){
for(char **token = tokens; *token; ++token){
puts(*token);
free(*token);
}
free(tokens);
}
return 0;
}
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