fix a previously undetected bug in str_strlcpy.

scripts/write-reports.lua

@@ -0,0 +1,19 @@
+local path = 'scripts'
+if config.install then
+    path = config.install .. '/' .. path
+end
+package.path = package.path .. ';' .. path .. '/?.lua;' .. path .. '/?/init.lua'
+require 'eressea'
+require 'eressea.xmlconf' -- read xml data
+
+local rules = {}
+if config.rules then
+    rules = require('eressea.' .. config.rules)
+    eressea.log.info('loaded ' .. #rules .. ' modules for ' .. config.rules)
+else
+    eressea.log.warning('no rule modules loaded, specify a game in eressea.ini or with -r')
+end
+
+eressea.read_game(get_turn() .. '.dat')
+init_reports()
+write_reports()

src/util/strings.c

@@ -78,7 +78,7 @@ size_t str_strlcpy(char *dst, const char *src, size_t len)
     if (n == 0) {
         if (len != 0)
             *d = '\0';                /* NUL-terminate dst */
-        while (*s++);
+        return (d - dst);         /* count does not include NUL */
     }
 
     return (s - src - 1);         /* count does not include NUL */
@@ -285,6 +285,7 @@ void sbs_strcat(struct sbstring *sbs, const char *str)
     len = sbs->size - (sbs->end - sbs->begin);
     len = str_strlcpy(sbs->end, str, len);
     sbs->end += len;
+    assert(sbs->begin + sbs->size >= sbs->end);
 }
 
 void sbs_strcpy(struct sbstring *sbs, const char *str)
@@ -294,23 +295,27 @@ void sbs_strcpy(struct sbstring *sbs, const char *str)
         len = sbs->size - 1;
     }
     sbs->end = sbs->begin + len;
+    assert(sbs->begin + sbs->size >= sbs->end);
 }
 
-void sbs_cut(sbstring *sbp, int bytes)
+void sbs_cut(sbstring *sbs, int bytes)
 {
     if (bytes > 0) {
-        size_t len = sbs_length(sbp) - bytes;
-        memmove(sbp->begin, sbp->begin + bytes, len + 1);
-        sbp->end = sbp->begin + len;
+        size_t len = sbs_length(sbs) - bytes;
+        memmove(sbs->begin, sbs->begin + bytes, len + 1);
+        sbs->end = sbs->begin + len;
     }
     else if (bytes < 0) {
-        size_t len = sbs_length(sbp) + bytes;
-        sbp->end = sbp->begin + len;
+        size_t len = sbs_length(sbs) + bytes;
+        sbs->end = sbs->begin + len;
     }
+    assert(sbs->begin + sbs->size >= sbs->end);
+    assert(sbs->end[0] == '\0');
 }
 
 size_t sbs_length(const struct sbstring *sbs)
 {
+    assert(sbs->begin + sbs->size >= sbs->end);
     return sbs->end - sbs->begin;
 }
 

src/util/strings.test.c

@@ -115,16 +115,21 @@ static void test_str_strlcpy(CuTest * tc)
 
     memset(buffer, 0x7f, sizeof(buffer));
 
-    CuAssertIntEquals(tc, 4, (int)str_strlcpy(buffer, "herp", 4));
-    CuAssertStrEquals(tc, "her", buffer);
-
-    CuAssertIntEquals(tc, 4, (int)str_strlcpy(buffer, "herp", 8)); /*-V666 */
+    CuAssertIntEquals(tc, 4, (int)str_strlcpy(buffer, "herp", 8));
     CuAssertStrEquals(tc, "herp", buffer);
     CuAssertIntEquals(tc, 0x7f, buffer[5]);
 
-    CuAssertIntEquals(tc, 8, (int)str_strlcpy(buffer, "herpderp", 8));
+    CuAssertIntEquals(tc, 3, (int)str_strlcpy(buffer, "herp", 4));
+    CuAssertStrEquals(tc, "her", buffer);
+
+    CuAssertIntEquals(tc, 7, (int)str_strlcpy(buffer, "herpderp", 8));
     CuAssertStrEquals(tc, "herpder", buffer);
     CuAssertIntEquals(tc, 0x7f, buffer[8]);
+
+    CuAssertIntEquals(tc, 8, (int)str_strlcpy(buffer, "herpderp", 16));
+    CuAssertStrEquals(tc, "herpderp", buffer);
+    CuAssertIntEquals(tc, 0x7f, buffer[9]);
+
     errno = 0;
 }
 
@@ -162,6 +167,30 @@ static void test_sbstring(CuTest * tc)
     CuAssertStrEquals(tc, "123456789012345", sbs.begin);
 }
 
+static void test_sbs_strcat(CuTest * tc)
+{
+    char buffer[8];
+    sbstring sbs;
+
+    sbs_init(&sbs, buffer, sizeof(buffer));
+    sbs_strcat(&sbs, "AB");
+    CuAssertStrEquals(tc, "AB", sbs.begin);
+    sbs_strcat(&sbs, "CD");
+    CuAssertStrEquals(tc, "ABCD", sbs.begin);
+
+    sbs_init(&sbs, buffer, sizeof(buffer));
+    sbs_strcat(&sbs, "12345678901234567890");
+    CuAssertStrEquals(tc, "1234567", sbs.begin);
+    sbs_strcat(&sbs, "12345678901234567890");
+    CuAssertStrEquals(tc, "1234567", sbs.begin);
+
+    sbs_init(&sbs, buffer, sizeof(buffer));
+    sbs_strncat(&sbs, "12345678901234567890", 4);
+    CuAssertStrEquals(tc, "1234", sbs.begin);
+    sbs_strncat(&sbs, "12345678901234567890", 4);
+    CuAssertStrEquals(tc, "1234123", sbs.begin);
+}
+
 CuSuite *get_strings_suite(void)
 {
     CuSuite *suite = CuSuiteNew();
@@ -175,5 +204,6 @@ CuSuite *get_strings_suite(void)
     SUITE_ADD_TEST(suite, test_str_strlcpy);
     SUITE_ADD_TEST(suite, test_str_itoa);
     SUITE_ADD_TEST(suite, test_sbstring);
+    SUITE_ADD_TEST(suite, test_sbs_strcat);
     return suite;
 }