c - Why does the cstdlib strncpy crash whilst copying a char array to a character pointer -


यह मेरा कोड है: 

  char * toc (char src [STRING_SIZE], char * Dest) {if (src [0] == 0) dest = NULL; अन्य strncpy (dest, & src [0], आकार_टी (strlen (src))); }   
 
 इसे कैसे बुलाया जाता है:  
  typedef struct sdata {char * point_one; } tsdata tsdata sdata; चार नाम [STRING_SIZE] = "point_data"; TOC (नाम, sdata.point_one);   
 strncpy हमेशा क्रैश करता है  
 मैं क्या कर रहा हूँ गलत?   
 
 
 यह कोड:  
  typedef struct sdata {char * point_one; } tsdata tsdata sdata; चार नाम [STRING_SIZE] = "point_data"; TOC (नाम, sdata.point_one);   
 कॉल  Toc  दूसरे तर्क के साथ एक अनिर्धारित संकेतक, जो कि मूल्य से पारित होता है।  
 उस  अनिश्चित मूल्य   
 
 सामान्य टिप्पणियां।  
 
 इस फ़ंक्शन घोषणा में ,  <पूर्व>  शून्य TOC (char src [STRING_SIZE], char * dest)   
     
  •   STRING_SIZE  द्वारा उपेक्षित है संकलक और निम्न कोड के लिए उपलब्ध नहीं है।   
     
     और इस कोड स्निपेट में:  
      if (src [0] == 0) dest = NULL;   
       
    •  असाइनमेंट एक स्थानीय चर (एक फ़ंक्शन तर्क) का मान बदलता है, जिसका उपयोग फ़ंक्शन में नहीं किया जाता है।   
       < p> इसके अलावा, अपडेट किए गए प्रश्न के लिए जहां फ़ंक्शन घोषणा को  
        char * ToC (char src [STRING_SIZE], char * dest) में बदल दिया गया था   
         
      •  फ़ंक्शन में  return  कथन नहीं है, इसलिए फ़ंक्शन परिणाम का कोई भी उपयोग अपरिभाषित व्यवहार है।

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