string.c

用于嵌入式Linux系统的标准C的库函数

#include "test.h"
#include <string.h>
#include <errno.h>


_CONST char *it = "<UNSET>";	/* Routine name for message routines. */
int  errors = 0;

/* Complain if condition is not true.  */
#define check(thing) checkit(thing, __LINE__)

void
_DEFUN(checkit,(ok,l),
       int ok _AND
       int l )

{
  newfunc(it);
  line(l);
  
  if (!ok)
  {
    printf("string.c:%d %s\n", l, it);
    ++errors;
  }
}



/* Complain if first two args don't strcmp as equal.  */
#define equal(a, b)  funcqual(a,b,__LINE__);

void
_DEFUN(funcqual,(a,b,l),
       char *a _AND
       char *b _AND
       int l)
{
  newfunc(it);
  
  line(l);
  if (a == NULL && b == NULL) return;
  if (strcmp(a,b)) {
      printf("string.c:%d (%s)\n", l, it);  
    }
}



static char one[50];
static char two[50];


void test_string()
{
  /* Test strcmp first because we use it to test other things.  */
  it = "strcmp";
  check(strcmp("", "") == 0); /* Trivial case. */
  check(strcmp("a", "a") == 0); /* Identity. */
  check(strcmp("abc", "abc") == 0); /* Multicharacter. */
  check(strcmp("abc", "abcd") < 0); /* Length mismatches. */
  check(strcmp("abcd", "abc") > 0);
  check(strcmp("abcd", "abce") < 0);	/* Honest miscompares. */
  check(strcmp("abce", "abcd") > 0);
  check(strcmp("a\103", "a") > 0); /* Tricky if char signed. */
  check(strcmp("a\103", "a\003") > 0);

  /* Test strcpy next because we need it to set up other tests.  */
  it = "strcpy";
  check(strcpy(one, "abcd") == one);	/* Returned value. */
  equal(one, "abcd");	/* Basic test. */

  (void) strcpy(one, "x");
  equal(one, "x");		/* Writeover. */
  equal(one+2, "cd");	/* Wrote too much? */

  (void) strcpy(two, "hi there");
  (void) strcpy(one, two);
  equal(one, "hi there");	/* Basic test encore. */
  equal(two, "hi there");	/* Stomped on source? */

  (void) strcpy(one, "");
  equal(one, "");		/* Boundary condition. */

  /* strcat.  */
  it = "strcat";
  (void) strcpy(one, "ijk");
  check(strcat(one, "lmn") == one); /* Returned value. */
  equal(one, "ijklmn");	/* Basic test. */

  (void) strcpy(one, "x");
  (void) strcat(one, "yz");
  equal(one, "xyz");		/* Writeover. */
  equal(one+4, "mn");	/* Wrote too much? */

  (void) strcpy(one, "gh");
  (void) strcpy(two, "ef");
  (void) strcat(one, two);
  equal(one, "ghef");	/* Basic test encore. */
  equal(two, "ef");		/* Stomped on source? */

  (void) strcpy(one, "");
  (void) strcat(one, "");
  equal(one, "");		/* Boundary conditions. */
  (void) strcpy(one, "ab");
  (void) strcat(one, "");
  equal(one, "ab");
  (void) strcpy(one, "");
  (void) strcat(one, "cd");
  equal(one, "cd");

  /* strncat - first test it as strcat, with big counts,
     then test the count mechanism.  */
  it = "strncat";
  (void) strcpy(one, "ijk");
  check(strncat(one, "lmn", 99) == one); /* Returned value. */
  equal(one, "ijklmn");	/* Basic test. */

  (void) strcpy(one, "x");
  (void) strncat(one, "yz", 99);
  equal(one, "xyz");		/* Writeover. */
  equal(one+4, "mn");	/* Wrote too much? */

  (void) strcpy(one, "gh");
  (void) strcpy(two, "ef");
  (void) strncat(one, two, 99);
  equal(one, "ghef");	/* Basic test encore. */
  equal(two, "ef");		/* Stomped on source? */

  (void) strcpy(one, "");
  (void) strncat(one, "", 99);
  equal(one, "");		/* Boundary conditions. */
  (void) strcpy(one, "ab");
  (void) strncat(one, "", 99);
  equal(one, "ab");
  (void) strcpy(one, "");
  (void) strncat(one, "cd", 99);
  equal(one, "cd");

  (void) strcpy(one, "ab");
  (void) strncat(one, "cdef", 2);
  equal(one, "abcd");	/* Count-limited. */

  (void) strncat(one, "gh", 0);
  equal(one, "abcd");	/* Zero count. */

  (void) strncat(one, "gh", 2);
  equal(one, "abcdgh");	/* Count _AND length equal. */
  it = "strncmp";
  /* strncmp - first test as strcmp with big counts";*/
  check(strncmp("", "", 99) == 0); /* Trivial case. */
  check(strncmp("a", "a", 99) == 0);	/* Identity. */
  check(strncmp("abc", "abc", 99) == 0); /* Multicharacter. */
  check(strncmp("abc", "abcd", 99) < 0); /* Length unequal. */
  check(strncmp("abcd", "abc",99) > 0);
  check(strncmp("abcd", "abce", 99) < 0); /* Honestly unequal. */
  check(strncmp("abce", "abcd",99)>0);
  check(strncmp("abce", "abcd", 3) == 0); /* Count limited. */
  check(strncmp("abce", "abc", 3) == 0); /* Count == length. */
  check(strncmp("abcd", "abce", 4) < 0); /* Nudging limit. */
  check(strncmp("abc", "def", 0) == 0); /* Zero count. */

  /* strncpy - testing is a bit different because of odd semantics.  */
  it = "strncpy";
  check(strncpy(one, "abc", 4) == one); /* Returned value. */
  equal(one, "abc");		/* Did the copy go right? */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 2);
  equal(one, "xycdefgh");	/* Copy cut by count. */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 3); /* Copy cut just before NUL. */
  equal(one, "xyzdefgh");

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 4); /* Copy just includes NUL. */
  equal(one, "xyz");
  equal(one+4, "efgh");	/* Wrote too much? */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 5); /* Copy includes padding. */
  equal(one, "xyz");
  equal(one+4, "");
  equal(one+5, "fgh");

  (void) strcpy(one, "abc");
  (void) strncpy(one, "xyz", 0); /* Zero-length copy. */
  equal(one, "abc");	

  (void) strncpy(one, "", 2);	/* Zero-length source. */
  equal(one, "");
  equal(one+1, "");	
  equal(one+2, "c");

  (void) strcpy(one, "hi there");
  (void) strncpy(two, one, 9);
  equal(two, "hi there");	/* Just paranoia. */
  equal(one, "hi there");	/* Stomped on source? */

  /* strlen.  */
  it = "strlen";
  check(strlen("") == 0);	/* Empty. */
  check(strlen("a") == 1);	/* Single char. */
  check(strlen("abcd") == 4); /* Multiple chars. */

  /* strchr.  */
  it = "strchr";
  check(strchr("abcd", 'z') == NULL); /* Not found. */
  (void) strcpy(one, "abcd");
  check(strchr(one, 'c') == one+2); /* Basic test. */
  check(strchr(one, 'd') == one+3); /* End of string. */
  check(strchr(one, 'a') == one); /* Beginning. */
  check(strchr(one, '\0') == one+4);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(strchr(one, 'b') == one+1); /* Finding first. */
  (void) strcpy(one, "");
  check(strchr(one, 'b') == NULL); /* Empty string. */
  check(strchr(one, '\0') == one); /* NUL in empty string. */

  /* index - just like strchr.  */
  it = "index";
  check(index("abcd", 'z') == NULL);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(index(one, 'c') == one+2); /* Basic test. */
  check(index(one, 'd') == one+3); /* End of string. */
  check(index(one, 'a') == one); /* Beginning. */
  check(index(one, '\0') == one+4); /* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(index(one, 'b') == one+1); /* Finding first. */
  (void) strcpy(one, "");
  check(index(one, 'b') == NULL); /* Empty string. */
  check(index(one, '\0') == one); /* NUL in empty string. */

  /* strrchr.  */
  it = "strrchr";
  check(strrchr("abcd", 'z') == NULL); /* Not found. */
  (void) strcpy(one, "abcd");
  check(strrchr(one, 'c') == one+2);	/* Basic test. */
  check(strrchr(one, 'd') == one+3);	/* End of string. */
  check(strrchr(one, 'a') == one); /* Beginning. */
  check(strrchr(one, '\0') == one+4); /* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(strrchr(one, 'b') == one+3);	/* Finding last. */
  (void) strcpy(one, "");
  check(strrchr(one, 'b') == NULL); /* Empty string. */
  check(strrchr(one, '\0') == one); /* NUL in empty string. */

  /* rindex - just like strrchr.  */
  it = "rindex";
  check(rindex("abcd", 'z') == NULL); /* Not found. */
  (void) strcpy(one, "abcd");
  check(rindex(one, 'c') == one+2); /* Basic test. */
  check(rindex(one, 'd') == one+3); /* End of string. */
  check(rindex(one, 'a') == one); /* Beginning. */
  check(rindex(one, '\0') == one+4);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(rindex(one, 'b') == one+3); /* Finding last. */
  (void) strcpy(one, "");
  check(rindex(one, 'b') == NULL); /* Empty string. */
  check(rindex(one, '\0') == one); /* NUL in empty string. */

  /* strpbrk - somewhat like strchr.  */
  it = "strpbrk";
  check(strpbrk("abcd", "z") == NULL); /* Not found. */
  (void) strcpy(one, "abcd");
  check(strpbrk(one, "c") == one+2);	/* Basic test. */
  check(strpbrk(one, "d") == one+3);	/* End of string. */
  check(strpbrk(one, "a") == one); /* Beginning. */
  check(strpbrk(one, "") == NULL); /* Empty search list. */
  check(strpbrk(one, "cb") == one+1); /* Multiple search. */
  (void) strcpy(one, "abcabdea");
  check(strpbrk(one, "b") == one+1);	/* Finding first. */
  check(strpbrk(one, "cb") == one+1); /* With multiple search. */
  check(strpbrk(one, "db") == one+1); /* Another variant. */
  (void) strcpy(one, "");
  check(strpbrk(one, "bc") == NULL); /* Empty string. */
  check(strpbrk(one, "") == NULL); /* Both strings empty. */