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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <regex.h>
  4.  
  5. struct token_t {
  6.   char *name;
  7.   char *pattern;
  8.   regex_t regex;
  9. };
  10.  
  11. #define TOKEN_ENTRY(name, regex) { #name, regex }
  12. #define ARRAYOF(array) (sizeof(array) / sizeof(*array))
  13.  
  14. struct token_t g_token[] = {
  15.   TOKEN_ENTRY(number, "^[-+]?[0-9]+$"),
  16.   TOKEN_ENTRY(string, ".*"),
  17. };
  18.  
  19. int initialize_token()
  20. {
  21.   int index;
  22.   for (index = 0; index < ARRAYOF(g_token); index++)
  23.     if (regcomp(&g_token[index].regex, g_token[index].pattern,
  24.                 REG_EXTENDED | REG_NEWLINE) < 0)
  25.       return -1;
  26.   return 0;
  27. }
  28.  
  29. void finalize_token()
  30. {
  31.   int index;
  32.   for (index = 0; index < ARRAYOF(g_token); index++)
  33.     regfree(&g_token[index].regex);
  34. }
  35.  
  36. int get_token_index(char *string)
  37. {
  38.   regmatch_t match[1];
  39.   int index;
  40.   for (index = 0; index < ARRAYOF(g_token); index++)
  41.     if (!regexec(&g_token[index].regex, string, 1, match, 0))
  42.       return index;
  43.   return -1;
  44. }
  45.  
  46. char *get_token_name(char *string)
  47. {
  48.   int index;
  49.   index = get_token_index(string);
  50.   return index != -1 ? g_token[index].name : "null";
  51. }
  52.  
  53. #define print(string) printf(string " = %s\n", get_token_name(string))
  54.  
  55. void do_run_while_ctrl_d()
  56. {
  57.   static char buffer[BUFSIZ];
  58.   char *ptr;
  59.  
  60.   buffer[sizeof(buffer) - 1] = '\0';
  61.   while (fgets(buffer, sizeof(buffer), stdin) != NULL) {
  62.     ptr = strchr(buffer, '\n');
  63.     if (ptr == NULL) {
  64.       fprintf(stderr, "Too long string (buffer size = %u)\n",
  65.               (unsigned int) sizeof(buffer) - 1);
  66.       return;
  67.     }
  68.     *ptr = '\0';
  69.     printf("%s\n", get_token_name(buffer));
  70.   }
  71. }
  72.  
  73. int main(int argc, char *argv[])
  74. {
  75.   initialize_token();
  76.   do_run_while_ctrl_d();
  77.   finalize_token();
  78.   return 0;
  79. }
  80.  
Success #stdin #stdout 0s 2436KB
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stdin
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1234
1234abncdef
ab^d34x
-92837
+37
stdout
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number
string
string
number
number
https://ideone.com/5C5Yf8
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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