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| #include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
struct Node
{
const char* pstr;
size_t length;
size_t count;
struct Node* next;
};
//-----------------------------------------------------------------------------
struct Node* findNode(struct Node* list, const char* pstr, size_t length)
{
for (; list && ((list->length != length) ||
strncmp(list->pstr, pstr, length)); list = list->next) { ; }
return list;
}
//-----------------------------------------------------------------------------
struct Node* pushWithCount(struct Node** list, const char* pstr, size_t length)
{
struct Node* node = findNode(*list, pstr, length);
if (node == NULL)
{
node = (struct Node*) malloc(sizeof(struct Node));
node->pstr = pstr;
node->length = length;
node->count = 1;
node->next = *list;
*list = node;
}
else
{
node->count++;
}
return *list;
}
//-----------------------------------------------------------------------------
struct Node* pushWithSort(struct Node** list, struct Node value)
{
struct Node* head = (struct Node*) malloc(sizeof(struct Node));
head->next = *list;
struct Node* node = head;
for (; node->next && (node->next->count > value.count); node = node->next) { ; }
struct Node* newnode = (struct Node*) malloc(sizeof(struct Node));
*newnode = value;
newnode->next = node->next;
node->next = newnode;
*list = head->next;
free(head);
return *list;
}
//-----------------------------------------------------------------------------
struct Node pop(struct Node** list)
{
struct Node value = {NULL, 0, 0, NULL};
if (*list)
{
struct Node* node = *list;
*list = (*list)->next;
value = *node;
value.next = NULL;
free(node);
}
return value;
}
//-----------------------------------------------------------------------------
void clear(struct Node** list)
{
struct Node* node;
while (*list)
{
node = *list;
*list = (*list)->next;
free(node);
}
}
//-----------------------------------------------------------------------------
struct Node* sort(struct Node** list)
{
struct Node* listSorted = NULL;
while (*list)
{
pushWithSort(&listSorted, pop(list));
}
*list = listSorted;
return NULL;
}
//-----------------------------------------------------------------------------
int getWord(const char* text, const char** begin, const char** end)
{
for (; *text && !isalpha(*text); ++text) { ; }
*begin = text;
for (; *text && isalpha(*text); ++text) { ; }
*end = text;
return (*begin < *end);
}
//-----------------------------------------------------------------------------
char* getText(FILE* f)
{
fseek(f, 0, SEEK_END);
fpos_t length;
fgetpos(f, &length);
fseek(f, 0, SEEK_SET);
char* text = (char*) malloc(sizeof(char) * (length + 1));
text[length] = 0;
fread(text, length, 1, f);
return text;
}
//-----------------------------------------------------------------------------
struct Node* getListFromText(const char* text)
{
struct Node* list = NULL;
const char* begin;
const char* end;
while (getWord(text, &begin, &end))
{
pushWithCount(&list, begin, end - begin);
text = end + 1;
}
return list;
}
//-----------------------------------------------------------------------------
void print(struct Node* list, size_t count)
{
if (count == 0)
{
count--;
}
for (; list && (count > 0); list = list->next, --count)
{
printf("%2d %.*s\n", list->count, list->length, list->pstr);
}
}
//-----------------------------------------------------------------------------
int main(int argc, const char* argv[])
{
if (argc != 2)
{
fprintf(stderr, "Usage: program <FILE.txt>\n");
system("pause");
return EXIT_FAILURE;
}
FILE* f = fopen(argv[1], "rb");
if (f == NULL)
{
perror(argv[1]);
return EXIT_FAILURE;
}
char* text = getText(f);
fclose(f);
struct Node* list = getListFromText(text);
sort(&list);
print(list, 10);
clear(&list);
free(text);
system("pause");
return EXIT_SUCCESS;
} |
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