segmentation fault by malloc [duplicate]

Question

I am having a serious problem of segmentation fault in my program.

Code:

bool load(const char* dictionary) { // creating a trie data structure typedef struct trie { bool is_word; struct trie* alphabets[27]; }trie; trie* root = NULL; //opening the dictionary file FILE* infile = fopen(dictionary, "r"); if (infile == NULL) { return false; } char s[45]; int i = 0, n = sizeof(trie); bool start = true; trie* tmp = NULL; for (int c = fgetc(infile); c != EOF; c = fgetc(infile)) { c = tolower(c); if (isalpha(c) || c == '\'') { s[i] = c; i++; start = false; } else if (start == false) { for (int j = 0; j < strlen(s); j++) { int c_int = (int) (s[j] - 'a'); if (tmp == NULL || root->alphabets[c_int] == NULL) { root->alphabets[c_int] = malloc(n); tmp = root->alphabets[c_int]; } else if (tmp != NULL) { tmp->alphabets[c_int] = malloc(n); tmp = tmp->alphabets[c_int]; } else if (root->alphabets[c_int] != NULL) { tmp = root->alphabets[c_int]; } if (j == strlen(s) - 1) { tmp->is_word = true; } } } } return true;

root->alphabets[c_int] = malloc(n); is the line giving a seg fault

The sample file to read from would give you more probability of response. Try to give all the information needed to reproduce the problem, begin with a minimal, complete, verifiable example. — NetVipeC
– NetVipeC, Commented Aug 3, 2014 at 3:25

Peter O. · Accepted Answer · 2014-08-03 11:06:05Z

3

You need to allocate memory for root.

That is:

root = malloc(sizeof(trie));

edited Aug 3, 2014 at 11:06

Peter O.

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answered Aug 3, 2014 at 3:01

Ed Heal

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