總線Mac上的錯誤10，而串聯設置的字符

你能告訴我什麼是錯，此代碼：總線Mac上的錯誤10，而串聯設置的字符

#include <stdio.h> 
#if __STDC_VERSION == 199901L 
#include <stdint.h> 
#include <string.h> 
#else 
/* change to fit the compiler */ 
typedef unsigned char uint8_t; 
typedef unsigned long uint32_t; 
#endif 
#define IPV4 
#if defined(IPV4) 
#define NBYTES 4 
#elif defined(IPV6) 
#error IPV6 not supported 
#else 
#error No valid IP version protocol defined 
#endif 

char* concat(char *s1, char *s2) 
{ 
    char *result = malloc(strlen(s1)+strlen(s2)+1);//+1 for the zero-terminator 
    //in real code you would check for errors in malloc here 
    strcpy(result, s1); 
    strcat(result, s2); 
    return result; 
} 

int main() 
{ 
    uint32_t ipAddress = 167840383; 
    uint8_t octet[NBYTES]; 
    int x; 
    char buffer[4]; 
    char buffer2[100]; 

    for (x = 0; x < NBYTES; x++) 
    { 
     octet[x] = (ipAddress >> (x * 8)) & (uint8_t)-1; 
    } 
    for (x = NBYTES - 1; x >= 0; --x) 
    { 
     // sprintf("%d", octet[x]); 
     sprintf(buffer2, "%d", octet[x]); 
     // if (x > 0) printf("."); 
     if (x > 0) { 
      char * temp = concat(buffer2, "."); 
      strcpy(buffer2, temp); 
     } 
    } 
    sprintf("\n%s", buffer2); 
    return 0; 
}

我想這段代碼重寫它串聯IP的每一部分的功能，它使用sprintf從32位整數獲取到buffer2 char變量，並返回一個帶有十進制IP表示的轉換後的字符串，但是當我運行已編譯的應用程序時，它會輸出錯誤：「總線錯誤：10」。

調試信息低於：

MacBook-Air-Pavel:gamind paus$ gcc -o int2ip int2ip.c 
int2ip.c:21:20: warning: implicitly declaring library function 'malloc' with type 'void *(unsigned long)' 
    char *result = malloc(strlen(s1)+strlen(s2)+1);//+1 for the zero-terminator 
       ^
int2ip.c:21:20: note: please include the header <stdlib.h> or explicitly provide a declaration for 'malloc' 
int2ip.c:21:27: warning: implicitly declaring library function 'strlen' with type 'unsigned long (const char *)' 
    char *result = malloc(strlen(s1)+strlen(s2)+1);//+1 for the zero-terminator 
         ^
int2ip.c:21:27: note: please include the header <string.h> or explicitly provide a declaration for 'strlen' 
int2ip.c:23:5: warning: implicitly declaring library function 'strcpy' with type 'char *(char *, const char *)' 
    strcpy(result, s1); 
    ^
int2ip.c:23:5: note: please include the header <string.h> or explicitly provide a declaration for 'strcpy' 
int2ip.c:24:5: warning: implicitly declaring library function 'strcat' with type 'char *(char *, const char *)' 
    strcat(result, s2); 
    ^
int2ip.c:24:5: note: please include the header <string.h> or explicitly provide a declaration for 'strcat' 
int2ip.c:50:21: warning: format string is not a string literal (potentially insecure) [-Wformat-security] 
    sprintf("\n%s", buffer2); 
        ^~~~~~~ 
/usr/include/secure/_stdio.h:47:56: note: expanded from macro 'sprintf' 
    __builtin___sprintf_chk (str, 0, __darwin_obsz(str), __VA_ARGS__) 
                ^
5 warnings generated.

我不知道爲什麼。你可以幫幫我嗎？

來源

2015-02-24 paus

你能調試並告訴我們在哪一行出現錯誤嗎？ – wimh 2015-02-24 10:52:36

您顯示的輸出不是調試信息，而是編譯器輸出。請閱讀並遵循以下建議：包括''和''。你不是在這裏過分複雜嗎？您的結果最多可以爲24個字符（對於IP6，包括終止空字符），因此不需要動態分配。此外，沒有'free'的分配會引入內存泄漏。 – 2015-02-24 11:15:04

sprintf("\n%s", buffer2);

那sprintf是錯的;你需要交換兩個參數。另外，請始終考慮使用snprintf。

另外，inet_ntop。

來源

2015-02-24 10:53:42 cnicutar

總線Mac上的錯誤10，而串聯設置的字符

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