C Valgrind - 条件跳转取决于ialialitialised值

时间:2013-11-30 17:53:55

标签: c malloc valgrind realloc

我想修复一个错误..

Valgrind这样说:

==9203== 1 errors in context 1 of 1:
==9203== Conditional jump or move depends on uninitialised value(s)
==9203==    at 0x4C2D64A: strncat (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9203==    by 0x400970: newSpeak (main.c:39)
==9203==    by 0x400A62: main (main.c:74)
==9203== 
--9203-- 
--9203-- used_suppression:      2 dl-hack3-cond-1
==9203== 
==9203== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)

这是我的函数newSpeak()

int velikost = 0, i = 0, delka = 0;
char * textNovy = NULL;

i = 0;
    while (text[i] != '\0') {
        delka++;
        i++;
    }

textNovy = (char*)malloc(sizeof(char));
    for (i = 0; i < delka; i++) {
        textNovy = (char*)realloc(textNovy, ((i+1)+velikost)*sizeof(char) );
        strncat(textNovy, text+i, 1);
    }
return textNovy;

值文本被赋予main的功能。 问题出现在strncat中

你呢!卢卡斯

1 个答案:

答案 0 :(得分:4)

你永远不会初始化textNovy的内容,但你会连接到它的结尾。这会导致您从valgrind看到的错误。

至少需要:

textNovy[0] = '\0';

(或等效的)malloc()之后。