C价研-条件跳转取决于统一值

Question

我想修复一个错误..。

瓦兰让我说：

==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)

下面是函数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;

从main函数中给出了值文本。问题就在某个地方

干掉你！！卢卡斯

Answer 1

您从来没有初始化过textNovy的内容，但是您一直连接到它的末尾。这将导致从valgrind中看到的错误。

你至少需要：

textNovy[0] = '\0';

(或等效的)在malloc()之后。