1. #ifndef CMPR_H
2. #define CMPR_H
3.  
4. #include <stdio.h>
5. #include <stdlib.h>
6.  
7. #define BUFSIZE 1024
8.  
9. #define ASCII_CHARS 126
10.  
11. #define PERROR(e, r)
12.     perror(e);
13.     return r;
14.  
15. typedef struct char_freq {
16.     char character;
17.     int frequency;
18. } Char_freq;
19.  
20. typedef struct freq_table {
21.     Char_freq freqs[ASCII_CHARS];
22.     size_t size;
23. } Freq_table;
24.  
25. // parses the file name from the list of command line arguments
26. // returns error
27. int parse_file_name(int argc, char *argv[], FILE **fd);
28.  
29. // reads a file into a buffer
30. // returns error
31. int read_file(char buf[BUFSIZE], FILE *fd);
32.  
33. // reads the text and adds the frequecy of each character to a table
34. // freq table: char **
35. int determine_char_freqs(FILE *fd);
36.  
37. // get frequency per each buffer iteration
38. void buf_freqs(char buf[], Freq_table *table);
39.  
40. #endif
41. -------------------------------------------------------------
42.  
43.  
44.  
45. #include <string.h>
46. #include <ctype.h>
47. #include "cmpr.h"
48.  
49.  
50. int main(int argc, char *argv[])
51. {
52.     FILE *fd = NULL;  
53.     int err = 0;
54.  
55.     if ((err = parse_file_name(argc, argv, &fd;)) == -1) {
56.         PERROR("open file", EXIT_FAILURE);
57.     }  
58.  
59.     determine_char_freqs(fd);
60.    
61.     return 0;
62. }
63.  
64. int parse_file_name(int argc, char *argv[], FILE **fd)
65. {
66.     *fd = fopen(argv[argc-1], "r");
67.     if (*fd == NULL) {
68.         return -1;
69.     }
70.     return 0;
71. }
72.  
73. int read_file(char buf[BUFSIZE], FILE *fd)
74. {
75.     size_t read;
76.     if ((read = fread(buf, sizeof(char), BUFSIZE-1, fd)) == EOF || read == 0) {
77.         return -1;
78.     }
79.     return 0;
80. }
81.  
82. int determine_char_freqs(FILE *fd)
83. {
84.     char buf[BUFSIZE] = {0};
85.     Freq_table ftable = {0};
86.     ftable.size = ASCII_CHARS;
87.  
88.     for (size_t i = 32; i <= ftable.size; i++)
89.         ftable.freqs[i].character = (char)i;
90.  
91.  
92.     // count text and fill table
93.     while(read_file(buf, fd) != -1) {
94.         buf_freqs(buf, &ftable;);
95.     }
96.  
97.     /**
98.     for (size_t i = 32; i <= ftable.size; i++) {
99.         if (isprint((unsigned char)ftable.freqs[i].character))
100.             printf("%cn", ftable.freqs[i].character);
101.     }
102.     **/
103.  
104.     for (size_t i = 32; i <= ftable.size; i++) {
105.         printf("%c : %dn", ftable.freqs[i].character, ftable.freqs[i].frequency);
106.     }
107.     return 0;
108. }
109.  
110.  
111. void buf_freqs(char buf[], Freq_table *table)
112. {
113.     while(*buf != '�') {
114.         for(size_t c = 32; c <= table->size; c++) {
115.             if (*buf == table->freqs[c].character) {
116.                 table->freqs[c].frequency++;
117.                 break;
118.             }
119.         }
120.         buf++;
121.     }
122. }
123.