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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char rbuf[128];
  6. char* rstring = "Test1\n"
  7.                 "Test2\n"
  8.                 "Test30\n";
  9. char wbuf[128];
  10.  
  11. void create_file(void)
  12. {
  13.   FILE* fp = fmemopen(rbuf, sizeof(rbuf), "w");
  14.   fwrite(rstring, strlen(rstring) + 1, 1, fp);
  15.   fclose(fp);
  16. }
  17.  
  18. void swap(char* a, char* b)
  19. {
  20.   char c = *a;
  21.   *a = *b;
  22.   *b = c;
  23. }
  24.  
  25. char* strrev(char* str)
  26. {
  27.   int i;
  28.   for (i=0; i<strlen(str)/2; i++)
  29.     swap(&str[i], &str[strlen(str)-1-i]);
  30.   return str;
  31. }
  32.  
  33.  
  34. int main(void)
  35. {
  36.   FILE *fp_r, *fp_w, *fp2;
  37.   char* buf = malloc(sizeof(rbuf));
  38.   char* buf2;
  39.  
  40.   /* Create Dummy File */
  41.   create_file();
  42.  
  43.   /* Open Read/Write File */
  44.   fp_r = fmemopen(rbuf, sizeof(rbuf), "r");
  45.   fp_w = fmemopen(wbuf, sizeof(wbuf), "w");
  46.  
  47.   while (!feof(fp_r)) {
  48.     /* Read from Dummy Read File */
  49.     fgets(buf, sizeof(rbuf), fp_r);
  50.     /* Reverse string */
  51.     buf[strlen(buf)-1] = NULL;
  52.     strrev(buf);
  53.     buf[strlen(buf)] = '\n';
  54.     /* Write to Write File */
  55.     fputs(buf, fp_w);
  56.   }
  57.  
  58.   free(buf);
  59.   fclose(fp_r);
  60.   fclose(fp_w);
  61.  
  62.   /* Check */
  63.   fp2 = fmemopen(wbuf, sizeof(wbuf), "r");
  64.   buf2 = malloc(sizeof(wbuf));
  65.   fread(buf2, sizeof(wbuf), 1, fp2);
  66.   fprintf(stdout, "%s", buf2);
  67.   free(buf2);
  68.   fclose(fp2);
  69.  
  70.   return EXIT_SUCCESS;
  71. }
  72.  
Success #stdin #stdout 0s 2380KB
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1tseT
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03tseT
https://ideone.com/LbCP7s
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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