porovnani-textovych-retezcu.c

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#include <stdio.h>
#include <stdlib.h>

#include <string.h>//strlen(), jinak impliciticni deklarace => na 64bitech Segmentation fault!!!

int up1_strcmp (const char *s1, const char *s2) {
    while (*s1 && *s2 && *s1 == *s2) {
      s1++, s2++;
    }
    return *s1 - *s2;//musime normalizovat na -1,0,1 ? strcmp() to taky nevraci
}

char *up1_strchr (const char *s, int c) {
   while (*s && *s++ != c)
     ;//zadne telo
   return *s == c ? (char*)s : NULL;
}

char *up1_strrchr (const char *s, int c) {
  return NULL; //TODO
}

size_t up1_strlen (const char *s) {
  size_t len = 0;
  while (*s++) len++;
  return len;
}

#define TEST_STRLEN(s) \
    printf("strlen(\"%s\")=%d dtto up1_strlen(\"%s\")=%d\n", (s), strlen((s)), (s), up1_strlen((s)))

int main (int argc, char *argv[]) {
    int diff;
    if (argc < 3) {
       fprintf(stderr, "Usage: %s slovo1 slovo2\n", argv[0]); return EXIT_FAILURE;
    }
    diff = up1_strcmp(argv[1], argv[2]);
    printf("Slovo \"%s\" je %s slovo \"%s\"\n",
           argv[1], diff ? diff > 0 ? "vetsi nez" : "mensi nez" : "rovno", argv[2]);

    printf("strlen(\"%s\")=%d dtto up1_strlen(\"%s\")=%d\n", argv[1], strlen(argv[1]), argv[1], up1_strlen(argv[1]));
    TEST_STRLEN(argv[0]);
    TEST_STRLEN(argv[2]);
    TEST_STRLEN("");
    return EXIT_SUCCESS;
}