[Bug c/22389] New: strlen from Function possible

[Bug c/22389] New: strlen from Function possible

[kleinalex at gmx dot at]

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Boyer-Search.c file:
int Search (char search[],char Text[]){
	unsigned int Plen = strlen(Search)-1;   // The Bug! S instead of s
	unsigned int Textlength = strlen(Text)-1;
	int Pattern[256];
	int i;int j;int k;
	int Position = Plen;
	for (i = 0; i < 256; i++){
		Pattern[i] = Plen;
	}
	for (i = Plen; i > 0; i--){
		Pattern[search[i]] = i;
	}
	do {
		j = Plen;
		k = Position;
		do {
			j--;
			k--;
		} while (search[j] == Text[k] && j >= 0);
		Position = Position + Pattern[Text[k]];
	} while (Position < Textlength && j >= 0);
	return Position;
}

gcc-4.0 -pg -ggdb -gstabs+ -fprofile-arcs -ftest-coverage -Wall -o BoyerMoore_Te
xtSuche Boyer-Search.c main.c
Boyer-Search.c: In function ‘Search’:
Boyer-Search.c:3: Warnung: implizite Deklaration der Funktion ‘strlen’
Boyer-Search.c:3: Warnung: unverträgliche implizite Deklaration der eingebauten
Funktion ‘strlen’
Boyer-Search.c:3: Warnung: Übergabe des Arguments 1 von ‘strlen’ von inkompatibl
em Zeigertyp
Boyer-Search.c:14: Warnung: Feldindex hat Typ ‘char’
Boyer-Search.c:24: Warnung: Feldindex hat Typ ‘char’

gcc give only warnings!

-- 
           Summary: strlen from Function possible
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kleinalex at gmx dot at
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22389

[Bug c/22389] strlen from Function possible

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-09 19:29 -------
Since you did not give a prototype of strlen (by including string.h), the C standard talks about implicit 
functions prototype and gives in this case strlen a prototype that takes a function type.

If you include string.h you will get a warning about incompatiable pointers which is what GCC emits as 
GCC has an extension that implicitly converts any pointer to another without a cast.  If you want an 
error in that case use -pedantic-error.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22389