我想编写一个程序，从字符串中删除任何单词（用户可以输入这个单词）。程序有效，但 valgirnd 给了我一些错误信息：
==3009== Command: ./remove3 infile
==3009==
Type word that you want to remove from the file:
go
==3009== Invalid write of size 1
==3009== at 0x4009CD: main (remove3.c:74)
==3009== Address 0x51f1041 is 0 bytes after a block of size 1 alloc'd
==3009== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==3009== by 0x400947: main (remove3.c:45)
==3009==
==3009== Invalid read of size 1
==3009== at 0x400AE6: DELTEword (remove3.c:115)
==3009== by 0x400A39: main (remove3.c:90)
==3009== Address 0x51f1041 is 0 bytes after a block of size 1 alloc'd
==3009== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==3009== by 0x400947: main (remove3.c:45)
==3009==
==3009== Invalid read of size 1
==3009== at 0x400B16: DELTEword (remove3.c:118)
==3009== by 0x400A39: main (remove3.c:90)
==3009== Address 0x51f1041 is 0 bytes after a block of size 1 alloc'd
==3009== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==3009== by 0x400947: main (remove3.c:45)
==3009==
That Katharina and Petruchio should be married,
And yet we hear not of our son-in-law.
What will be said? what mockery will it be,
To what bridegroom when the priest attends
To speak the ceremonial rites of marriage!
What says Lucentio to this shame of ours?
==3009==
==3009== HEAP SUMMARY:
==3009== in use at exit: 1 bytes in 1 blocks
==3009== total heap usage: 50 allocs, 49 frees, 1,181 bytes allocated
==3009==
==3009== LEAK SUMMARY:
==3009== definitely lost: 1 bytes in 1 blocks
==3009== indirectly lost: 0 bytes in 0 blocks
==3009== possibly lost: 0 bytes in 0 blocks
==3009== still reachable: 0 bytes in 0 blocks
==3009== suppressed: 0 bytes in 0 blocks
==3009== Rerun with --leak-check=full to see details of leaked memory
==3009==
==3009== For counts of detected and suppressed errors, rerun with: -v
==3009== ERROR SUMMARY: 95 errors from 3 contexts (suppressed: 2 from 2)
我也想问一下主体。我不完全确定我从键盘获取字符的方式是否正确，例如：当我输入“go”时，一切正常，但无法删除“To”这个词，为什么？
这是我的代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define CHUNK 12
char *getWord(FILE *infile);
int DELTEword(char *word, char *KEYword);
char *getWord(FILE *infile)
{
int length, cursor = 0, c;
char *word, *word2;
word = (char*)malloc(sizeof(char)*CHUNK);
if(word == NULL) return NULL;
length = CHUNK;
while((c = getc(infile)) != ' ' && !feof(infile))
{
word[cursor] = c;
cursor++;
if(cursor >= length)
{
length += CHUNK;
word2 = (char*)realloc(word, length*sizeof(char));
if(word2 == NULL)
{
free(word);
return NULL;
}
else word = word2;
}
}
word[cursor] = '\0';
return word;
}
int main(int argc, char *argv[])
{
char *word, c, *keyWord = (char*)malloc(sizeof(char));
FILE *infile;
int length;
int size = 20;
if(argc != 2)
{
printf("\nMissing arguments.\n");
abort();
}
if(keyWord == NULL) return 0;
printf("Type word that you want to remove from the file:\n");
length = 0;
while(1)
{
if(length == size)
{
keyWord = (char*)realloc(keyWord, size + 10);
size += 10;
}
c = getchar();
if(c == '\n') break;
keyWord[length] = c;
length++;
}
infile = fopen(argv[1], "r");
if(infile != NULL)
{
while(!feof(infile))
{
word = getWord(infile);
if(word == NULL)
{
free(word);
break;
}
if(DELTEword(word, keyWord) == 1)
{
printf(word, infile);
printf(" ");
free(word);
}
}
}
else
{
printf("It is impossible to open the infile\n");
abort();
}
fclose(infile);
return 0;
}
int DELTEword(char *word, char *KEYword)
{
int i, k = 0, l = 0, length;
char *ptr;
if(word != NULL)
{
length = strlen(KEYword);
for(i = 0; word[i] != '\0'; i++)
{
if(word[i] == KEYword[k])
{
l++;
k++;
}
else break;
if(l == length)
{
ptr = &word[i];
memmove((ptr - length) + 1, ptr + 1, strlen((ptr - length) + 1));
l = 0;
k = 0;
}
}
return 1;
}
else return 0;
}
感谢您的任何帮助。