Merge from libretro/master:46902e0 for repo synchronization

platform/libretro/libretro-common/string/stdstring.c

@@ -0,0 +1,384 @@
+/* Copyright  (C) 2010-2018 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (stdstring.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <ctype.h>
+
+#include <string/stdstring.h>
+#include <encodings/utf.h>
+
+char *string_to_upper(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+      *cs = toupper((unsigned char)*cs);
+   return s;
+}
+
+char *string_to_lower(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+      *cs = tolower((unsigned char)*cs);
+   return s;
+}
+
+char *string_ucwords(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+   {
+      if (*cs == ' ')
+         *(cs+1) = toupper((unsigned char)*(cs+1));
+   }
+
+   s[0] = toupper((unsigned char)s[0]);
+   return s;
+}
+
+char *string_replace_substring(const char *in,
+      const char *pattern, const char *replacement)
+{
+   size_t numhits, pattern_len, replacement_len, outlen;
+   const char *inat   = NULL;
+   const char *inprev = NULL;
+   char          *out = NULL;
+   char        *outat = NULL;
+
+   /* if either pattern or replacement is NULL,
+    * duplicate in and let caller handle it. */
+   if (!pattern || !replacement)
+      return strdup(in);
+
+   pattern_len     = strlen(pattern);
+   replacement_len = strlen(replacement);
+   numhits         = 0;
+   inat            = in;
+
+   while ((inat = strstr(inat, pattern)))
+   {
+      inat += pattern_len;
+      numhits++;
+   }
+
+   outlen          = strlen(in) - pattern_len*numhits + replacement_len*numhits;
+   out             = (char *)malloc(outlen+1);
+
+   if (!out)
+      return NULL;
+
+   outat           = out;
+   inat            = in;
+   inprev          = in;
+
+   while ((inat = strstr(inat, pattern)))
+   {
+      memcpy(outat, inprev, inat-inprev);
+      outat += inat-inprev;
+      memcpy(outat, replacement, replacement_len);
+      outat += replacement_len;
+      inat += pattern_len;
+      inprev = inat;
+   }
+   strcpy(outat, inprev);
+
+   return out;
+}
+
+/* Remove leading whitespaces */
+char *string_trim_whitespace_left(char *const s)
+{
+   if(s && *s)
+   {
+      size_t len     = strlen(s);
+      char *current  = s;
+
+      while(*current && isspace((unsigned char)*current))
+      {
+         ++current;
+         --len;
+      }
+
+      if(s != current)
+         memmove(s, current, len + 1);
+   }
+
+   return s;
+}
+
+/* Remove trailing whitespaces */
+char *string_trim_whitespace_right(char *const s)
+{
+   if(s && *s)
+   {
+      size_t len     = strlen(s);
+      char  *current = s + len - 1;
+
+      while(current != s && isspace((unsigned char)*current))
+      {
+         --current;
+         --len;
+      }
+
+      current[isspace((unsigned char)*current) ? 0 : 1] = '\0';
+   }
+
+   return s;
+}
+
+/* Remove leading and trailing whitespaces */
+char *string_trim_whitespace(char *const s)
+{
+   string_trim_whitespace_right(s);  /* order matters */
+   string_trim_whitespace_left(s);
+
+   return s;
+}
+
+char *word_wrap(char* buffer, const char *string, int line_width, bool unicode, unsigned max_lines)
+{
+   unsigned i     = 0;
+   unsigned len   = (unsigned)strlen(string);
+   unsigned lines = 1;
+
+   while (i < len)
+   {
+      unsigned counter;
+      int pos = (int)(&buffer[i] - buffer);
+
+      /* copy string until the end of the line is reached */
+      for (counter = 1; counter <= (unsigned)line_width; counter++)
+      {
+         const char *character;
+         unsigned char_len;
+         unsigned j = i;
+
+         /* check if end of string reached */
+         if (i == len)
+         {
+            buffer[i] = 0;
+            return buffer;
+         }
+
+         character = utf8skip(&string[i], 1);
+         char_len  = (unsigned)(character - &string[i]);
+
+         if (!unicode)
+            counter += char_len - 1;
+
+         do
+         {
+            buffer[i] = string[i];
+            char_len--;
+            i++;
+         } while(char_len);
+
+         /* check for newlines embedded in the original input
+          * and reset the index */
+         if (buffer[j] == '\n')
+         {
+            lines++;
+            counter = 1;
+         }
+      }
+
+      /* check for whitespace */
+      if (string[i] == ' ')
+      {
+         if ((max_lines == 0 || lines < max_lines))
+         {
+            buffer[i] = '\n';
+            i++;
+            lines++;
+         }
+      }
+      else
+      {
+         int k;
+
+         /* check for nearest whitespace back in string */
+         for (k = i; k > 0; k--)
+         {
+            if (string[k] != ' ' || (max_lines != 0 && lines >= max_lines))
+               continue;
+
+            buffer[k] = '\n';
+            /* set string index back to character after this one */
+            i         = k + 1;
+            lines++;
+            break;
+         }
+
+         if (&buffer[i] - buffer == pos)
+            return buffer;
+      }
+   }
+
+   buffer[i] = 0;
+
+   return buffer;
+}
+
+/* Splits string into tokens seperated by 'delim'
+ * > Returned token string must be free()'d
+ * > Returns NULL if token is not found
+ * > After each call, 'str' is set to the position after the
+ *   last found token
+ * > Tokens *include* empty strings
+ * Usage example:
+ *    char *str      = "1,2,3,4,5,6,7,,,10,";
+ *    char **str_ptr = &str;
+ *    char *token    = NULL;
+ *    while((token = string_tokenize(str_ptr, ",")))
+ *    {
+ *        printf("%s\n", token);
+ *        free(token);
+ *        token = NULL;
+ *    }
+ */
+char* string_tokenize(char **str, const char *delim)
+{
+   /* Taken from https://codereview.stackexchange.com/questions/216956/strtok-function-thread-safe-supports-empty-tokens-doesnt-change-string# */
+   char *str_ptr    = NULL;
+   char *delim_ptr  = NULL;
+   char *token      = NULL;
+   size_t token_len = 0;
+
+   /* Sanity checks */
+   if (!str || string_is_empty(delim))
+      return NULL;
+
+   str_ptr = *str;
+
+   /* Note: we don't check string_is_empty() here,
+    * empty strings are valid */
+   if (!str_ptr)
+      return NULL;
+
+   /* Search for delimiter */
+   delim_ptr = strstr(str_ptr, delim);
+
+   if (delim_ptr)
+      token_len = delim_ptr - str_ptr;
+   else
+      token_len = strlen(str_ptr);
+
+   /* Allocate token string */
+   token = (char *)malloc((token_len + 1) * sizeof(char));
+
+   if (!token)
+      return NULL;
+
+   /* Copy token */
+   strlcpy(token, str_ptr, (token_len + 1) * sizeof(char));
+   token[token_len] = '\0';
+
+   /* Update input string pointer */
+   *str = delim_ptr ? delim_ptr + strlen(delim) : NULL;
+
+   return token;
+}
+
+/* Removes every instance of character 'c' from 'str' */
+void string_remove_all_chars(char *str, char c)
+{
+   char *read_ptr  = NULL;
+   char *write_ptr = NULL;
+
+   if (string_is_empty(str))
+      return;
+
+   read_ptr  = str;
+   write_ptr = str;
+
+   while (*read_ptr != '\0')
+   {
+      *write_ptr = *read_ptr++;
+      write_ptr += (*write_ptr != c) ? 1 : 0;
+   }
+
+   *write_ptr = '\0';
+}
+
+/* Replaces every instance of character 'find' in 'str'
+ * with character 'replace' */
+void string_replace_all_chars(char *str, char find, char replace)
+{
+   char *str_ptr = str;
+
+   if (string_is_empty(str))
+      return;
+
+   while((str_ptr = strchr(str_ptr, find)) != NULL)
+      *str_ptr++ = replace;
+}
+
+/* Converts string to unsigned integer.
+ * Returns 0 if string is invalid  */
+unsigned string_to_unsigned(const char *str)
+{
+   const char *ptr = NULL;
+
+   if (string_is_empty(str))
+      return 0;
+
+   for (ptr = str; *ptr != '\0'; ptr++)
+   {
+      if (!isdigit(*ptr))
+         return 0;
+   }
+
+   return (unsigned)strtoul(str, NULL, 10);
+}
+
+/* Converts hexadecimal string to unsigned integer.
+ * Handles optional leading '0x'.
+ * Returns 0 if string is invalid  */
+unsigned string_hex_to_unsigned(const char *str)
+{
+   const char *hex_str = str;
+   const char *ptr     = NULL;
+   size_t len;
+
+   if (string_is_empty(str))
+      return 0;
+
+   /* Remove leading '0x', if required */
+   len = strlen(str);
+
+   if (len >= 2)
+      if ((str[0] == '0') &&
+          ((str[1] == 'x') || (str[1] == 'X')))
+         hex_str = str + 2;
+
+   if (string_is_empty(hex_str))
+      return 0;
+
+   /* Check for valid characters */
+   for (ptr = hex_str; *ptr != '\0'; ptr++)
+   {
+      if (!isxdigit(*ptr))
+         return 0;
+   }
+
+   return (unsigned)strtoul(hex_str, NULL, 16);
+}