PVS V1010: access before start of buffer after fgets

Change-Id: I8cfa1e8a3c8dd8c2837e51756ac3eeaea1e756f0
Reviewed-on: https://review.haiku-os.org/c/1639
Reviewed-by: waddlesplash <[email protected]>

src/bin/mimeset.cpp

@@ -238,8 +238,10 @@ main(int argc, const char** argv)
 			// read file names from stdin
 			char name[B_PATH_NAME_LENGTH];
 			while (fgets(name, sizeof(name), stdin) != NULL) {
-				name[strlen(name) - 1] = '\0';
-					// remove trailing '\n'
+				if (name[0] != '\0') {
+					name[strlen(name) - 1] = '\0';
+						// remove trailing '\n'
+				}
 				if (process_file(name) != B_OK)
 					exit(1);
 			}

src/bin/pc/pc.c

@@ -284,7 +284,7 @@ do_input(void)
   
   while(fgets(buff, 256, stdin) != NULL)
    {
-     if (buff[strlen(buff)-1] == '\n')
+     if (buff[0] != '\0' && buff[strlen(buff)-1] == '\n')
        buff[strlen(buff)-1] = '\0';     /* kill the newline character */
 
      for(ptr=buff; isspace(*ptr) && *ptr; ptr++)

src/libs/bsd/getpass.c

@@ -38,7 +38,7 @@ getpass(const char *prompt)
 	if (fgets(password, sizeof(password), stdin) != NULL) {
 		size_t length = strlen(password);
 
-		if (password[length - 1] == '\n')
+		if (length > 0 && (password[length - 1] == '\n'))
 			password[length - 1] = '\0';
 
 		if (changed) {