XUtils string related updates

- allow count out-parameter of String_split() to be NULL
- introduce xStrndup()
- do not allow NULL pointers passed to String_eq()
  it is not used in any code
- implement String_startsWith(), String_contains_i() and String_eq()
  as inline header functions
- adjust several conversion issues

XUtils.c

@@ -54,11 +54,11 @@ void* xRealloc(void* ptr, size_t size) {
 }
 
 char* String_cat(const char* s1, const char* s2) {
-   int l1 = strlen(s1);
-   int l2 = strlen(s2);
+   const size_t l1 = strlen(s1);
+   const size_t l2 = strlen(s2);
    char* out = xMalloc(l1 + l2 + 1);
    memcpy(out, s1, l1);
-   memcpy(out+l1, s2, l2+1);
+   memcpy(out+l1, s2, l2);
    out[l1 + l2] = '\0';
    return out;
 }
@@ -67,39 +67,24 @@ char* String_trim(const char* in) {
    while (in[0] == ' ' || in[0] == '\t' || in[0] == '\n') {
       in++;
    }
-   int len = strlen(in);
+
+   size_t len = strlen(in);
    while (len > 0 && (in[len-1] == ' ' || in[len-1] == '\t' || in[len-1] == '\n')) {
       len--;
    }
-   char* out = xMalloc(len+1);
-   strncpy(out, in, len);
-   out[len] = '\0';
-   return out;
+
+   return xStrndup(in, len);
 }
 
-inline int String_eq(const char* s1, const char* s2) {
-   if (s1 == NULL || s2 == NULL) {
-      if (s1 == NULL && s2 == NULL)
-         return 1;
-      else
-         return 0;
-   }
-   return (strcmp(s1, s2) == 0);
-}
-
-char** String_split(const char* s, char sep, int* n) {
-   *n = 0;
-   const int rate = 10;
+char** String_split(const char* s, char sep, size_t* n) {
+   const unsigned int rate = 10;
    char** out = xCalloc(rate, sizeof(char*));
-   int ctr = 0;
-   int blocks = rate;
-   char* where;
+   size_t ctr = 0;
+   unsigned int blocks = rate;
+   const char* where;
    while ((where = strchr(s, sep)) != NULL) {
-      int size = where - s;
-      char* token = xMalloc(size + 1);
-      strncpy(token, s, size);
-      token[size] = '\0';
-      out[ctr] = token;
+      size_t size = (size_t)(where - s);
+      out[ctr] = xStrndup(s, size);
       ctr++;
       if (ctr == blocks) {
          blocks += rate;
@@ -113,7 +98,10 @@ char** String_split(const char* s, char sep, int* n) {
    }
    out = xRealloc(out, sizeof(char*) * (ctr + 1));
    out[ctr] = NULL;
-   *n = ctr;
+
+   if (n)
+      *n = ctr;
+
    return out;
 }
 
@@ -121,28 +109,28 @@ void String_freeArray(char** s) {
    if (!s) {
       return;
    }
-   for (int i = 0; s[i] != NULL; i++) {
+   for (size_t i = 0; s[i] != NULL; i++) {
       free(s[i]);
    }
    free(s);
 }
 
 char* String_getToken(const char* line, const unsigned short int numMatch) {
-   const unsigned short int len = strlen(line);
+   const size_t len = strlen(line);
    char inWord = 0;
    unsigned short int count = 0;
    char match[50];
 
-   unsigned short int foundCount = 0;
+   size_t foundCount = 0;
 
-   for (unsigned short int i = 0; i < len; i++) {
+   for (size_t i = 0; i < len; i++) {
       char lastState = inWord;
       inWord = line[i] == ' ' ? 0:1;
 
       if (lastState == 0 && inWord == 1)
          count++;
 
-      if(inWord == 1){
+      if (inWord == 1){
          if (count == numMatch && line[i] != ' ' && line[i] != '\0' && line[i] != '\n' && line[i] != (char)EOF) {
             match[foundCount] = line[i];
             foundCount++;
@@ -155,8 +143,8 @@ char* String_getToken(const char* line, const unsigned short int numMatch) {
 }
 
 char* String_readLine(FILE* fd) {
-   const int step = 1024;
-   int bufSize = step;
+   const unsigned int step = 1024;
+   unsigned int bufSize = step;
    char* buffer = xMalloc(step + 1);
    char* at = buffer;
    for (;;) {
@@ -213,3 +201,11 @@ char* xStrdup(const char* str) {
    }
    return data;
 }
+
+char* xStrndup(const char* str, size_t len) {
+   char* data = strndup(str, len);
+   if (!data) {
+      fail();
+   }
+   return data;
+}