有人可以告诉我如何纠正这个警告/错误。我试图只获取字符串的第一个字符来判断它是否为“-”。
错误:
grep-lite.c:15:13: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
if(strcmp((char *) pattern[0],"-") == 0)
^
grep-lite.c:29:16: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
while(strcmp((char *) argv[index][0],"-"))
^
带有警告/错误的来源:
第 15 行:
if (strcmp((char *) pattern[0],"-") == 0)
第 29 行:
while (strcmp((char *) argv[index][0],"-"))
完整来源:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "grep-lite.h"
int main(int argc, char * * argv)
{
//initailize variables
int index = 1, lineNumber = 1;
int oneMatchingLine = FALSE;
int invertOpt = FALSE, lineNumOpt = FALSE, quietOpt = FALSE;
char * pattern = argv[argc];
//check if last arguement is invalid by starting with a '-'
if(strcmp((char *) pattern[0],"-") == 0)
{
error(INVALID_PATTERN);
return EXIT_ERROR;
}
//check if they asked for help
if(strcmp(argv[index],"--help") == 0)
{
printHelpStatement();
return EXIT_SUCCESS;
}
//walk through all options
while(strcmp((char *) argv[index][0],"-"))
{
//find and set option
if(processOptions(argv[index], &invertOpt, &lineNumOpt, &quietOpt))
index++;
//if invalid option fai
else
{
error(INVALID_OPTION);
return EXIT_ERROR;
}
}
//walk through stdinput searching for pattern relationship
while(feof(stdin) == 0)
{
//initialize
char * thisLine = NULL;
// get read line with fgets
thisLine = fgets(thisLine, MAX_CHARACTERS, stdin);
//find pattern location in thisLine
char * patternLoc = strstr(thisLine, pattern);
//check if we should print this line based of patternLoc and invertOpt
if((!patternLoc != NULL && !invertOpt) || (pattenLoc == NULL && invertOpt))
{
//see if we should print this line
if(!quietOpt)
printLine(thisLine, lineNumOpt, lineNumber);
}
lineNumber++;
}