shardz

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git clone git://git.acid.vegas/-c.git
shardz.c (1301B)
      1 // SHARDZ - Shard the output of any process for distributed processin - Developed by acidvegas in C (https://github.com/acidvegas/shardz)
      2 // shardz.c
      3 
      4 #include <stdio.h>
      5 #include <stdlib.h>
      6 #include <string.h>
      7 
      8 void print_usage(const char* program_name) {
      9     fprintf(stderr, "Usage: %s INDEX/TOTAL\n", program_name);
     10     exit(1);
     11 }
     12 
     13 int main(int argc, char *argv[]) {
     14     if (argc != 2) {
     15         print_usage(argv[0]);
     16     }
     17 
     18     char *slash = strchr(argv[1], '/');
     19     if (!slash) {
     20         print_usage(argv[0]);
     21     }
     22 
     23     *slash = '\0';
     24     char *index_str = argv[1];
     25     char *total_str = slash + 1;
     26 
     27     char *endptr;
     28     long index = strtol(index_str, &endptr, 10);
     29     if (*endptr != '\0' || index < 1) {
     30         print_usage(argv[0]);
     31     }
     32 
     33     long total = strtol(total_str, &endptr, 10);
     34     if (*endptr != '\0' || total < 1) {
     35         print_usage(argv[0]);
     36     }
     37 
     38     if (index > total) {
     39         fprintf(stderr, "Error: INDEX cannot be greater than TOTAL\n");
     40         exit(1);
     41     }
     42 
     43     char *line = NULL;
     44     size_t len = 0;
     45     ssize_t read;
     46     long current_line = 1;
     47 
     48     while ((read = getline(&line, &len, stdin)) != -1) {
     49         if (((current_line - index) % total) == 0) {
     50             printf("%s", line);
     51         }
     52         current_line++;
     53     }
     54 
     55     free(line);
     56     return 0;
     57 }