当我在循环中调用 free 时，我在 C 中进行了一些文本提取并获得了一些“垃圾字符串”。这是一些示例文本：
Sentence #1 (34 tokens):
The Project Gutenberg EBook of Moby Dick; or The Whale, by Herman Melville
This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever.
[Text=The CharacterOffsetBegin=0 CharacterOffsetEnd=3 PartOfSpeech=DT Lemma=the] [Text=Project CharacterOffsetBegin=4 CharacterOffsetEnd=11 PartOfSpeech=NN Lemma=project]
问题：
1 - 释放指针变量后我可以安全地重用它吗？
谢谢你的帮助！
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINE_M (1024*100)
int main(int argc, char **argv)
{
FILE *file;
char buff[LINE_M];
char *lemma;
char *text;
char *sentence = NULL;
char *p, *t;
int numSent, numTok;
file = fopen("moby.txt.out", "r");
while (fgets(buff, LINE_M, file))
{
if(sscanf(buff, "Sentence #%d (%d tokens):", &numSent, &numTok))
continue;
if(strstr(buff, "[Text=") == NULL)
{
if(sentence != NULL)
{
sentence = realloc(sentence, (strlen(buff) + strlen(sentence) + 2) * sizeof(char));
strcat(sentence, buff);
}
else
{
sentence = malloc(sizeof(char) * (strlen(buff) + 1));
strcpy(sentence, buff);
}
continue;
}
p = buff;
while ((p = strstr(p, "Text=")) != NULL)
{
p += 5;
t = strchr(p, ' ');
text = malloc((int)(t - p));
strncpy(text, p, (int)(t - p));
p = strstr(t + 1, "Lemma=") + 6;
t = strchr(p, ']');
lemma = malloc((int)(t - p) * sizeof(char));
strncpy(lemma, p, (int)(t - p));
p = t + 1;
printf("%s\n", lemma);
free(text);
free(lemma);
text = NULL;
lemma = NULL;
}
free(sentence);
sentence = NULL;
}
fclose(file);
return 0;
}