tester.c

一个C源代码分析器

#include <ansidecl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>

#ifndef HAVE_GNU_LD
#define _sys_nerr	sys_nerr
#define _sys_errlist	sys_errlist
#endif

#define	STREQ(a, b)	(strcmp((a), (b)) == 0)

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

/* Complain if condition is not true.  */
void
DEFUN(check, (thing, number), int thing AND int number)
{
  if (!thing)
    {
      printf("%s flunked test %d\n", it, number);
      ++errors;
    }
}

/* Complain if first two args don't strcmp as equal.  */
void
DEFUN(equal, (a, b, number), CONST char *a AND CONST char *b AND int number)
{
  check(a != NULL && b != NULL && STREQ(a, b), number);
}

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

int
DEFUN(main, (argc, argv), int argc AND char **argv)
{
  /* Test strcmp first because we use it to test other things.  */
  it = "strcmp";
  check(strcmp("", "") == 0, 1);		/* Trivial case. */
  check(strcmp("a", "a") == 0, 2);		/* Identity. */
  check(strcmp("abc", "abc") == 0, 3);		/* Multicharacter. */
  check(strcmp("abc", "abcd") < 0, 4);		/* Length mismatches. */
  check(strcmp("abcd", "abc") > 0, 5);
  check(strcmp("abcd", "abce") < 0, 6);		/* Honest miscompares. */
  check(strcmp("abce", "abcd") > 0, 7);
  check(strcmp("a\203", "a") > 0, 8);		/* Tricky if char signed. */
  check(strcmp("a\203", "a\003") > 0, 9);

  /* Test strcpy next because we need it to set up other tests.  */
  it = "strcpy";
  check(strcpy(one, "abcd") == one, 1);	/* Returned value. */
  equal(one, "abcd", 2);		/* Basic test. */

  (void) strcpy(one, "x");
  equal(one, "x", 3);			/* Writeover. */
  equal(one+2, "cd", 4);		/* Wrote too much? */

  (void) strcpy(two, "hi there");
  (void) strcpy(one, two);
  equal(one, "hi there", 5);		/* Basic test encore. */
  equal(two, "hi there", 6);		/* Stomped on source? */

  (void) strcpy(one, "");
  equal(one, "", 7);			/* Boundary condition. */

  /* strcat.  */
  it = "strcat";
  (void) strcpy(one, "ijk");
  check(strcat(one, "lmn") == one, 1);	/* Returned value. */
  equal(one, "ijklmn", 2);		/* Basic test. */

  (void) strcpy(one, "x");
  (void) strcat(one, "yz");
  equal(one, "xyz", 3);			/* Writeover. */
  equal(one+4, "mn", 4);			/* Wrote too much? */

  (void) strcpy(one, "gh");
  (void) strcpy(two, "ef");
  (void) strcat(one, two);
  equal(one, "ghef", 5);			/* Basic test encore. */
  equal(two, "ef", 6);			/* Stomped on source? */

  (void) strcpy(one, "");
  (void) strcat(one, "");
  equal(one, "", 7);			/* Boundary conditions. */
  (void) strcpy(one, "ab");
  (void) strcat(one, "");
  equal(one, "ab", 8);
  (void) strcpy(one, "");
  (void) strcat(one, "cd");
  equal(one, "cd", 9);

  /* 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, 1);	/* Returned value. */
  equal(one, "ijklmn", 2);		/* Basic test. */

  (void) strcpy(one, "x");
  (void) strncat(one, "yz", 99);
  equal(one, "xyz", 3);			/* Writeover. */
  equal(one+4, "mn", 4);			/* Wrote too much? */

  (void) strcpy(one, "gh");
  (void) strcpy(two, "ef");
  (void) strncat(one, two, 99);
  equal(one, "ghef", 5);			/* Basic test encore. */
  equal(two, "ef", 6);			/* Stomped on source? */

  (void) strcpy(one, "");
  (void) strncat(one, "", 99);
  equal(one, "", 7);			/* Boundary conditions. */
  (void) strcpy(one, "ab");
  (void) strncat(one, "", 99);
  equal(one, "ab", 8);
  (void) strcpy(one, "");
  (void) strncat(one, "cd", 99);
  equal(one, "cd", 9);

  (void) strcpy(one, "ab");
  (void) strncat(one, "cdef", 2);
  equal(one, "abcd", 10);			/* Count-limited. */

  (void) strncat(one, "gh", 0);
  equal(one, "abcd", 11);			/* Zero count. */

  (void) strncat(one, "gh", 2);
  equal(one, "abcdgh", 12);		/* Count and length equal. */

  /* strncmp - first test as strcmp with big counts,
     then test count code.  */
  it = "strncmp";
  check(strncmp("", "", 99) == 0, 1);	/* Trivial case. */
  check(strncmp("a", "a", 99) == 0, 2);	/* Identity. */
  check(strncmp("abc", "abc", 99) == 0, 3);	/* Multicharacter. */
  check(strncmp("abc", "abcd", 99) < 0, 4);	/* Length unequal. */
  check(strncmp("abcd", "abc", 99) > 0, 5);
  check(strncmp("abcd", "abce", 99) < 0, 6);	/* Honestly unequal. */
  check(strncmp("abce", "abcd", 99) > 0, 7);
  check(strncmp("a\203", "a", 2) > 0, 8);	/* Tricky if '\203' < 0 */
  check(strncmp("a\203", "a\003", 2) > 0, 9);
  check(strncmp("abce", "abcd", 3) == 0, 10);	/* Count limited. */
  check(strncmp("abce", "abc", 3) == 0, 11);	/* Count == length. */
  check(strncmp("abcd", "abce", 4) < 0, 12);	/* Nudging limit. */
  check(strncmp("abc", "def", 0) == 0, 13);	/* Zero count. */

  /* strncpy - testing is a bit different because of odd semantics.  */
  it = "strncpy";
  check(strncpy(one, "abc", 4) == one, 1);	/* Returned value. */
  equal(one, "abc", 2);			/* Did the copy go right? */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 2);
  equal(one, "xycdefgh", 3);		/* Copy cut by count. */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 3);		/* Copy cut just before NUL. */
  equal(one, "xyzdefgh", 4);

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 4);		/* Copy just includes NUL. */
  equal(one, "xyz", 5);
  equal(one+4, "efgh", 6);		/* Wrote too much? */

  (void) strcpy(one, "abcdefgh");
  (void) strncpy(one, "xyz", 5);		/* Copy includes padding. */
  equal(one, "xyz", 7);
  equal(one+4, "", 8);
  equal(one+5, "fgh", 9);

  (void) strcpy(one, "abc");
  (void) strncpy(one, "xyz", 0);		/* Zero-length copy. */
  equal(one, "abc", 10);	

  (void) strncpy(one, "", 2);		/* Zero-length source. */
  equal(one, "", 11);
  equal(one+1, "", 12);	
  equal(one+2, "c", 13);

  (void) strcpy(one, "hi there");
  (void) strncpy(two, one, 9);
  equal(two, "hi there", 14);		/* Just paranoia. */
  equal(one, "hi there", 15);		/* Stomped on source? */

  /* strlen.  */
  it = "strlen";
  check(strlen("") == 0, 1);		/* Empty. */
  check(strlen("a") == 1, 2);		/* Single char. */
  check(strlen("abcd") == 4, 3);		/* Multiple chars. */

  /* strchr.  */
  it = "strchr";
  check(strchr("abcd", 'z') == NULL, 1);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(strchr(one, 'c') == one+2, 2);	/* Basic test. */
  check(strchr(one, 'd') == one+3, 3);	/* End of string. */
  check(strchr(one, 'a') == one, 4);	/* Beginning. */
  check(strchr(one, '\0') == one+4, 5);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(strchr(one, 'b') == one+1, 6);	/* Finding first. */
  (void) strcpy(one, "");
  check(strchr(one, 'b') == NULL, 7);	/* Empty string. */
  check(strchr(one, '\0') == one, 8);	/* NUL in empty string. */

#if 0
  /* index - just like strchr.  */
  it = "index";
  check(index("abcd", 'z') == NULL, 1);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(index(one, 'c') == one+2, 2);	/* Basic test. */
  check(index(one, 'd') == one+3, 3);	/* End of string. */
  check(index(one, 'a') == one, 4);	/* Beginning. */
  check(index(one, '\0') == one+4, 5);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(index(one, 'b') == one+1, 6);	/* Finding first. */
  (void) strcpy(one, "");
  check(index(one, 'b') == NULL, 7);	/* Empty string. */
  check(index(one, '\0') == one, 8);	/* NUL in empty string. */
#endif

  /* strrchr.  */
  it = "strrchr";
  check(strrchr("abcd", 'z') == NULL, 1);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(strrchr(one, 'c') == one+2, 2);	/* Basic test. */
  check(strrchr(one, 'd') == one+3, 3);	/* End of string. */
  check(strrchr(one, 'a') == one, 4);	/* Beginning. */
  check(strrchr(one, '\0') == one+4, 5);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(strrchr(one, 'b') == one+3, 6);	/* Finding last. */
  (void) strcpy(one, "");
  check(strrchr(one, 'b') == NULL, 7);	/* Empty string. */
  check(strrchr(one, '\0') == one, 8);	/* NUL in empty string. */

#if 0
  /* rindex - just like strrchr.  */
  it = "rindex";
  check(rindex("abcd", 'z') == NULL, 1);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(rindex(one, 'c') == one+2, 2);	/* Basic test. */
  check(rindex(one, 'd') == one+3, 3);	/* End of string. */
  check(rindex(one, 'a') == one, 4);	/* Beginning. */
  check(rindex(one, '\0') == one+4, 5);	/* Finding NUL. */
  (void) strcpy(one, "ababa");
  check(rindex(one, 'b') == one+3, 6);	/* Finding last. */
  (void) strcpy(one, "");
  check(rindex(one, 'b') == NULL, 7);	/* Empty string. */
  check(rindex(one, '\0') == one, 8);	/* NUL in empty string. */
#endif

  /* strpbrk - somewhat like strchr.  */
  it = "strpbrk";
  check(strpbrk("abcd", "z") == NULL, 1);	/* Not found. */
  (void) strcpy(one, "abcd");
  check(strpbrk(one, "c") == one+2, 2);	/* Basic test. */
  check(strpbrk(one, "d") == one+3, 3);	/* End of string. */
  check(strpbrk(one, "a") == one, 4);	/* Beginning. */
  check(strpbrk(one, "") == NULL, 5);	/* Empty search list. */
  check(strpbrk(one, "cb") == one+1, 6);	/* Multiple search. */
  (void) strcpy(one, "abcabdea");
  check(strpbrk(one, "b") == one+1, 7);	/* Finding first. */
  check(strpbrk(one, "cb") == one+1, 8);	/* With multiple search. */
  check(strpbrk(one, "db") == one+1, 9);	/* Another variant. */
  (void) strcpy(one, "");
  check(strpbrk(one, "bc") == NULL, 10);	/* Empty string. */
  check(strpbrk(one, "") == NULL, 11);	/* Both strings empty. */

  /* strstr - somewhat like strchr.  */
  it = "strstr";
  check(strstr("abcd", "z") == NULL, 1);	/* Not found. */
  check(strstr("abcd", "abx") == NULL, 2);	/* Dead end. */
  (void) strcpy(one, "abcd");
  check(strstr(one, "c") == one+2, 3);	/* Basic test. */
  check(strstr(one, "bc") == one+1, 4);	/* Multichar. */
  check(strstr(one, "d") == one+3, 5);	/* End of string. */
  check(strstr(one, "cd") == one+2, 6);	/* Tail of string. */
  check(strstr(one, "abc") == one, 7);	/* Beginning. */
  check(strstr(one, "abcd") == one, 8);	/* Exact match. */
  check(strstr(one, "abcde") == NULL, 9);	/* Too long. */