miniIni lib added

lib/minIni/minGlue.h

@@ -0,0 +1,15 @@
+/*  Glue functions for the minIni library to SdFat library */
+
+#include <SdFat.h>
+
+extern SdFs SD;
+
+#define INI_READONLY 1
+#define INI_FILETYPE                    FsFile
+#define ini_openread(filename,file)     ((file)->open(SD.vol(), filename, O_RDONLY))
+#define ini_close(file)                 ((file)->close())
+#define ini_read(buffer,size,file)      ((file)->fgets((buffer),(size)) > 0)
+
+#define INI_FILEPOS                     fspos_t
+#define ini_tell(file,pos)              ((file)->fgetpos(pos))
+#define ini_seek(file,pos)              ((file)->fsetpos(pos))

lib/minIni/minIni.cpp

@@ -0,0 +1,952 @@
+/*  minIni - Multi-Platform INI file parser, suitable for embedded systems
+ *
+ *  These routines are in part based on the article "Multiplatform .INI Files"
+ *  by Joseph J. Graf in the March 1994 issue of Dr. Dobb's Journal.
+ *
+ *  Copyright (c) CompuPhase, 2008-2021
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ *  use this file except in compliance with the License. You may obtain a copy
+ *  of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ *  Version: $Id: minIni.c 53 2015-01-18 13:35:11Z thiadmer.riemersma@gmail.com $
+ */
+
+#if (defined _UNICODE || defined __UNICODE__ || defined UNICODE) && !defined INI_ANSIONLY
+# if !defined UNICODE   /* for Windows */
+#   define UNICODE
+# endif
+# if !defined _UNICODE  /* for C library */
+#   define _UNICODE
+# endif
+#endif
+
+#define MININI_IMPLEMENTATION
+#include "minIni.h"
+#if defined NDEBUG
+  #define assert(e)
+#else
+  #include <assert.h>
+#endif
+
+#if !defined __T || defined INI_ANSIONLY
+  #include <ctype.h>
+  #include <string.h>
+  #include <stdlib.h>
+  #define TCHAR     char
+  #define __T(s)    s
+  #define _tcscat   strcat
+  #define _tcschr   strchr
+  #define _tcscmp   strcmp
+  #define _tcscpy   strcpy
+  #define _tcsicmp  stricmp
+  #define _tcslen   strlen
+  #define _tcsncmp  strncmp
+  #define _tcsnicmp strnicmp
+  #define _tcsrchr  strrchr
+  #define _tcstol   strtol
+  #define _tcstod   strtod
+  #define _totupper toupper
+  #define _stprintf sprintf
+  #define _tfgets   fgets
+  #define _tfputs   fputs
+  #define _tfopen   fopen
+  #define _tremove  remove
+  #define _trename  rename
+#endif
+
+#if defined __linux || defined __linux__
+  #define __LINUX__
+#elif defined FREEBSD && !defined __FreeBSD__
+  #define __FreeBSD__
+#elif defined(_MSC_VER)
+  #pragma warning(disable: 4996)	/* for Microsoft Visual C/C++ */
+#endif
+#if !defined strnicmp && !defined PORTABLE_STRNICMP
+  #if defined __LINUX__ || defined __FreeBSD__ || defined __OpenBSD__ || defined __APPLE__ || defined __NetBSD__ || defined __DragonFly__ || defined __GNUC__
+    #define strnicmp  strncasecmp
+  #endif
+#endif
+#if !defined _totupper
+  #define _totupper toupper
+#endif
+
+#if !defined INI_LINETERM
+  #if defined __LINUX__ || defined __FreeBSD__ || defined __OpenBSD__ || defined __APPLE__ || defined __NetBSD__ || defined __DragonFly__
+    #define INI_LINETERM    __T("\n")
+  #else
+    #define INI_LINETERM    __T("\r\n")
+  #endif
+#endif
+#if !defined INI_FILETYPE
+  #error Missing definition for INI_FILETYPE.
+#endif
+
+#if !defined sizearray
+  #define sizearray(a)    (sizeof(a) / sizeof((a)[0]))
+#endif
+
+enum quote_option {
+  QUOTE_NONE,
+  QUOTE_ENQUOTE,
+  QUOTE_DEQUOTE,
+};
+
+#if defined PORTABLE_STRNICMP
+int strnicmp(const TCHAR *s1, const TCHAR *s2, size_t n)
+{
+  while (n-- != 0 && (*s1 || *s2)) {
+    register int c1, c2;
+    c1 = *s1++;
+    if ('a' <= c1 && c1 <= 'z')
+      c1 += ('A' - 'a');
+    c2 = *s2++;
+    if ('a' <= c2 && c2 <= 'z')
+      c2 += ('A' - 'a');
+    if (c1 != c2)
+      return c1 - c2;
+  }
+  return 0;
+}
+#endif /* PORTABLE_STRNICMP */
+
+static TCHAR *skipleading(const TCHAR *str)
+{
+  assert(str != NULL);
+  while ('\0' < *str && *str <= ' ')
+    str++;
+  return (TCHAR *)str;
+}
+
+static TCHAR *skiptrailing(const TCHAR *str, const TCHAR *base)
+{
+  assert(str != NULL);
+  assert(base != NULL);
+  while (str > base && '\0' < *(str-1) && *(str-1) <= ' ')
+    str--;
+  return (TCHAR *)str;
+}
+
+static TCHAR *striptrailing(TCHAR *str)
+{
+  TCHAR *ptr = skiptrailing(_tcschr(str, '\0'), str);
+  assert(ptr != NULL);
+  *ptr = '\0';
+  return str;
+}
+
+static TCHAR *ini_strncpy(TCHAR *dest, const TCHAR *source, size_t maxlen, enum quote_option option)
+{
+  size_t d, s;
+
+  assert(maxlen>0);
+  assert(source != NULL && dest != NULL);
+  assert((dest < source || (dest == source && option != QUOTE_ENQUOTE)) || dest > source + strlen(source));
+  if (option == QUOTE_ENQUOTE && maxlen < 3)
+    option = QUOTE_NONE;  /* cannot store two quotes and a terminating zero in less than 3 characters */
+
+  switch (option) {
+  case QUOTE_NONE:
+    for (d = 0; d < maxlen - 1 && source[d] != '\0'; d++)
+      dest[d] = source[d];
+    assert(d < maxlen);
+    dest[d] = '\0';
+    break;
+  case QUOTE_ENQUOTE:
+    d = 0;
+    dest[d++] = '"';
+    for (s = 0; source[s] != '\0' && d < maxlen - 2; s++, d++) {
+      if (source[s] == '"') {
+        if (d >= maxlen - 3)
+          break;  /* no space to store the escape character plus the one that follows it */
+        dest[d++] = '\\';
+      }
+      dest[d] = source[s];
+    }
+    dest[d++] = '"';
+    dest[d] = '\0';
+    break;
+  case QUOTE_DEQUOTE:
+    for (d = s = 0; source[s] != '\0' && d < maxlen - 1; s++, d++) {
+      if ((source[s] == '"' || source[s] == '\\') && source[s + 1] == '"')
+        s++;
+      dest[d] = source[s];
+    }
+    dest[d] = '\0';
+    break;
+  default:
+    assert(0);
+  }
+
+  return dest;
+}
+
+static TCHAR *cleanstring(TCHAR *string, enum quote_option *quotes)
+{
+  int isstring;
+  TCHAR *ep;
+
+  assert(string != NULL);
+  assert(quotes != NULL);
+
+  /* Remove a trailing comment */
+  isstring = 0;
+  for (ep = string; *ep != '\0' && ((*ep != ';' && *ep != '#') || isstring); ep++) {
+    if (*ep == '"') {
+      if (*(ep + 1) == '"')
+        ep++;                 /* skip "" (both quotes) */
+      else
+        isstring = !isstring; /* single quote, toggle isstring */
+    } else if (*ep == '\\' && *(ep + 1) == '"') {
+      ep++;                   /* skip \" (both quotes */
+    }
+  }
+  assert(ep != NULL && (*ep == '\0' || *ep == ';' || *ep == '#'));
+  *ep = '\0';                 /* terminate at a comment */
+  striptrailing(string);
+  /* Remove double quotes surrounding a value */
+  *quotes = QUOTE_NONE;
+  if (*string == '"' && (ep = _tcschr(string, '\0')) != NULL && *(ep - 1) == '"') {
+    string++;
+    *--ep = '\0';
+    *quotes = QUOTE_DEQUOTE;  /* this is a string, so remove escaped characters */
+  }
+  return string;
+}
+
+static int getkeystring(INI_FILETYPE *fp, const TCHAR *Section, const TCHAR *Key,
+                        int idxSection, int idxKey, TCHAR *Buffer, int BufferSize,
+                        INI_FILEPOS *mark)
+{
+  TCHAR *sp, *ep;
+  int len, idx;
+  enum quote_option quotes;
+  TCHAR LocalBuffer[INI_BUFFERSIZE];
+
+  assert(fp != NULL);
+  /* Move through file 1 line at a time until a section is matched or EOF. If
+   * parameter Section is NULL, only look at keys above the first section. If
+   * idxSection is positive, copy the relevant section name.
+   */
+  len = (Section != NULL) ? (int)_tcslen(Section) : 0;
+  if (len > 0 || idxSection >= 0) {
+    assert(idxSection >= 0 || Section != NULL);
+    idx = -1;
+    do {
+      do {
+        if (!ini_read(LocalBuffer, INI_BUFFERSIZE, fp))
+          return 0;
+        sp = skipleading(LocalBuffer);
+        ep = _tcsrchr(sp, ']');
+      } while (*sp != '[' || ep == NULL);
+      /* When arrived here, a section was found; now optionally skip leading and
+       * trailing whitespace.
+       */
+      assert(sp != NULL && *sp == '[');
+      sp = skipleading(sp + 1);
+      assert(ep != NULL && *ep == ']');
+      ep = skiptrailing(ep, sp);
+    } while ((((int)(ep-sp) != len || Section == NULL || _tcsnicmp(sp, Section, len) != 0) && ++idx != idxSection));
+    if (idxSection >= 0) {
+      if (idx == idxSection) {
+        assert(ep != NULL);
+        *ep = '\0'; /* the end of the section name was found earlier */
+        ini_strncpy(Buffer, sp, BufferSize, QUOTE_NONE);
+        return 1;
+      }
+      return 0; /* no more section found */
+    }
+  }
+
+  /* Now that the section has been found, find the entry.
+   * Stop searching upon leaving the section's area.
+   */
+  assert(Key != NULL || idxKey >= 0);
+  len = (Key != NULL) ? (int)_tcslen(Key) : 0;
+  idx = -1;
+  do {
+    if (mark != NULL)
+      ini_tell(fp, mark);   /* optionally keep the mark to the start of the line */
+    if (!ini_read(LocalBuffer,INI_BUFFERSIZE,fp) || *(sp = skipleading(LocalBuffer)) == '[')
+      return 0;
+    sp = skipleading(LocalBuffer);
+    ep = _tcschr(sp, '=');  /* Parse out the equal sign */
+    if (ep == NULL)
+      ep = _tcschr(sp, ':');
+  } while (*sp == ';' || *sp == '#' || ep == NULL
+           || ((len == 0 || (int)(skiptrailing(ep,sp)-sp) != len || _tcsnicmp(sp,Key,len) != 0) && ++idx != idxKey));
+  if (idxKey >= 0) {
+    if (idx == idxKey) {
+      assert(ep != NULL);
+      assert(*ep == '=' || *ep == ':');
+      *ep = '\0';
+      striptrailing(sp);
+      ini_strncpy(Buffer, sp, BufferSize, QUOTE_NONE);
+      return 1;
+    }
+    return 0;   /* no more key found (in this section) */
+  }
+
+  /* Copy up to BufferSize chars to buffer */
+  assert(ep != NULL);
+  assert(*ep == '=' || *ep == ':');
+  sp = skipleading(ep + 1);
+  sp = cleanstring(sp, &quotes);  /* Remove a trailing comment */
+  ini_strncpy(Buffer, sp, BufferSize, quotes);
+  return 1;
+}
+
+/** ini_gets()
+ * \param Section     the name of the section to search for
+ * \param Key         the name of the entry to find the value of
+ * \param DefValue    default string in the event of a failed read
+ * \param Buffer      a pointer to the buffer to copy into
+ * \param BufferSize  the maximum number of characters to copy
+ * \param Filename    the name and full path of the .ini file to read from
+ *
+ * \return            the number of characters copied into the supplied buffer
+ */
+int ini_gets(const TCHAR *Section, const TCHAR *Key, const TCHAR *DefValue,
+             TCHAR *Buffer, int BufferSize, const TCHAR *Filename)
+{
+  INI_FILETYPE fp;
+  int ok = 0;
+
+  if (Buffer == NULL || BufferSize <= 0 || Key == NULL)
+    return 0;
+  if (ini_openread(Filename, &fp)) {
+    ok = getkeystring(&fp, Section, Key, -1, -1, Buffer, BufferSize, NULL);
+    (void)ini_close(&fp);
+  }
+  if (!ok)
+    ini_strncpy(Buffer, (DefValue != NULL) ? DefValue : __T(""), BufferSize, QUOTE_NONE);
+  return (int)_tcslen(Buffer);
+}
+
+/** ini_getl()
+ * \param Section     the name of the section to search for
+ * \param Key         the name of the entry to find the value of
+ * \param DefValue    the default value in the event of a failed read
+ * \param Filename    the name of the .ini file to read from
+ *
+ * \return            the value located at Key
+ */
+long ini_getl(const TCHAR *Section, const TCHAR *Key, long DefValue, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[64];
+  int len = ini_gets(Section, Key, __T(""), LocalBuffer, sizearray(LocalBuffer), Filename);
+  return (len == 0) ? DefValue
+                    : ((len >= 2 && _totupper((int)LocalBuffer[1]) == 'X') ? _tcstol(LocalBuffer, NULL, 16)
+                                                                           : _tcstol(LocalBuffer, NULL, 10));
+}
+
+#if defined INI_REAL
+/** ini_getf()
+ * \param Section     the name of the section to search for
+ * \param Key         the name of the entry to find the value of
+ * \param DefValue    the default value in the event of a failed read
+ * \param Filename    the name of the .ini file to read from
+ *
+ * \return            the value located at Key
+ */
+INI_REAL ini_getf(const TCHAR *Section, const TCHAR *Key, INI_REAL DefValue, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[64];
+  int len = ini_gets(Section, Key, __T(""), LocalBuffer, sizearray(LocalBuffer), Filename);
+  return (len == 0) ? DefValue : ini_atof(LocalBuffer);
+}
+#endif
+
+/** ini_getbool()
+ * \param Section     the name of the section to search for
+ * \param Key         the name of the entry to find the value of
+ * \param DefValue    default value in the event of a failed read; it should
+ *                    zero (0) or one (1).
+ * \param Filename    the name and full path of the .ini file to read from
+ *
+ * A true boolean is found if one of the following is matched:
+ * - A string starting with 'y' or 'Y'
+ * - A string starting with 't' or 'T'
+ * - A string starting with '1'
+ *
+ * A false boolean is found if one of the following is matched:
+ * - A string starting with 'n' or 'N'
+ * - A string starting with 'f' or 'F'
+ * - A string starting with '0'
+ *
+ * \return            the true/false flag as interpreted at Key
+ */
+int ini_getbool(const TCHAR *Section, const TCHAR *Key, int DefValue, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[2] = __T("");
+  int ret;
+
+  ini_gets(Section, Key, __T(""), LocalBuffer, sizearray(LocalBuffer), Filename);
+  LocalBuffer[0] = (TCHAR)_totupper((int)LocalBuffer[0]);
+  if (LocalBuffer[0] == 'Y' || LocalBuffer[0] == '1' || LocalBuffer[0] == 'T')
+    ret = 1;
+  else if (LocalBuffer[0] == 'N' || LocalBuffer[0] == '0' || LocalBuffer[0] == 'F')
+    ret = 0;
+  else
+    ret = DefValue;
+
+  return(ret);
+}
+
+/** ini_getsection()
+ * \param idx         the zero-based sequence number of the section to return
+ * \param Buffer      a pointer to the buffer to copy into
+ * \param BufferSize  the maximum number of characters to copy
+ * \param Filename    the name and full path of the .ini file to read from
+ *
+ * \return            the number of characters copied into the supplied buffer
+ */
+int  ini_getsection(int idx, TCHAR *Buffer, int BufferSize, const TCHAR *Filename)
+{
+  INI_FILETYPE fp;
+  int ok = 0;
+
+  if (Buffer == NULL || BufferSize <= 0 || idx < 0)
+    return 0;
+  if (ini_openread(Filename, &fp)) {
+    ok = getkeystring(&fp, NULL, NULL, idx, -1, Buffer, BufferSize, NULL);
+    (void)ini_close(&fp);
+  }
+  if (!ok)
+    *Buffer = '\0';
+  return (int)_tcslen(Buffer);
+}
+
+/** ini_getkey()
+ * \param Section     the name of the section to browse through, or NULL to
+ *                    browse through the keys outside any section
+ * \param idx         the zero-based sequence number of the key to return
+ * \param Buffer      a pointer to the buffer to copy into
+ * \param BufferSize  the maximum number of characters to copy
+ * \param Filename    the name and full path of the .ini file to read from
+ *
+ * \return            the number of characters copied into the supplied buffer
+ */
+int  ini_getkey(const TCHAR *Section, int idx, TCHAR *Buffer, int BufferSize, const TCHAR *Filename)
+{
+  INI_FILETYPE fp;
+  int ok = 0;
+
+  if (Buffer == NULL || BufferSize <= 0 || idx < 0)
+    return 0;
+  if (ini_openread(Filename, &fp)) {
+    ok = getkeystring(&fp, Section, NULL, -1, idx, Buffer, BufferSize, NULL);
+    (void)ini_close(&fp);
+  }
+  if (!ok)
+    *Buffer = '\0';
+  return (int)_tcslen(Buffer);
+}
+
+/** ini_hassection()
+ * \param Section     the name of the section to search for
+ * \param Filename    the name of the .ini file to read from
+ *
+ * \return            1 if the section is found, 0 if not found
+ */
+int ini_hassection(const mTCHAR *Section, const mTCHAR *Filename)
+{
+  TCHAR LocalBuffer[32];  /* dummy buffer */
+  INI_FILETYPE fp;
+  int ok = 0;
+
+  if (ini_openread(Filename, &fp)) {
+    ok = getkeystring(&fp, Section, NULL, -1, 0, LocalBuffer, sizearray(LocalBuffer), NULL);
+    (void)ini_close(&fp);
+  }
+  return ok;
+}
+
+/** ini_haskey()
+ * \param Section     the name of the section to search for
+ * \param Key         the name of the entry to find the value of
+ * \param Filename    the name of the .ini file to read from
+ *
+ * \return            1 if the key is found, 0 if not found
+ */
+int ini_haskey(const mTCHAR *Section, const mTCHAR *Key, const mTCHAR *Filename)
+{
+  TCHAR LocalBuffer[32];  /* dummy buffer */
+  INI_FILETYPE fp;
+  int ok = 0;
+
+  if (ini_openread(Filename, &fp)) {
+    ok = getkeystring(&fp, Section, Key, -1, -1, LocalBuffer, sizearray(LocalBuffer), NULL);
+    (void)ini_close(&fp);
+  }
+  return ok;
+}
+
+
+#if !defined INI_NOBROWSE
+/** ini_browse()
+ * \param Callback    a pointer to a function that will be called for every
+ *                    setting in the INI file.
+ * \param UserData    arbitrary data, which the function passes on the
+ *                    \c Callback function
+ * \param Filename    the name and full path of the .ini file to read from
+ *
+ * \return            1 on success, 0 on failure (INI file not found)
+ *
+ * \note              The \c Callback function must return 1 to continue
+ *                    browsing through the INI file, or 0 to stop. Even when the
+ *                    callback stops the browsing, this function will return 1
+ *                    (for success).
+ */
+int ini_browse(INI_CALLBACK Callback, void *UserData, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[INI_BUFFERSIZE];
+  int lenSec, lenKey;
+  enum quote_option quotes;
+  INI_FILETYPE fp;
+
+  if (Callback == NULL)
+    return 0;
+  if (!ini_openread(Filename, &fp))
+    return 0;
+
+  LocalBuffer[0] = '\0';   /* copy an empty section in the buffer */
+  lenSec = (int)_tcslen(LocalBuffer) + 1;
+  for ( ;; ) {
+    TCHAR *sp, *ep;
+    if (!ini_read(LocalBuffer + lenSec, INI_BUFFERSIZE - lenSec, &fp))
+      break;
+    sp = skipleading(LocalBuffer + lenSec);
+    /* ignore empty strings and comments */
+    if (*sp == '\0' || *sp == ';' || *sp == '#')
+      continue;
+    /* see whether we reached a new section */
+    ep = _tcsrchr(sp, ']');
+    if (*sp == '[' && ep != NULL) {
+      sp = skipleading(sp + 1);
+      ep = skiptrailing(ep, sp);
+      *ep = '\0';
+      ini_strncpy(LocalBuffer, sp, INI_BUFFERSIZE, QUOTE_NONE);
+      lenSec = (int)_tcslen(LocalBuffer) + 1;
+      continue;
+    }
+    /* not a new section, test for a key/value pair */
+    ep = _tcschr(sp, '=');    /* test for the equal sign or colon */
+    if (ep == NULL)
+      ep = _tcschr(sp, ':');
+    if (ep == NULL)
+      continue;               /* invalid line, ignore */
+    *ep++ = '\0';             /* split the key from the value */
+    striptrailing(sp);
+    ini_strncpy(LocalBuffer + lenSec, sp, INI_BUFFERSIZE - lenSec, QUOTE_NONE);
+    lenKey = (int)_tcslen(LocalBuffer + lenSec) + 1;
+    /* clean up the value */
+    sp = skipleading(ep);
+    sp = cleanstring(sp, &quotes);  /* Remove a trailing comment */
+    ini_strncpy(LocalBuffer + lenSec + lenKey, sp, INI_BUFFERSIZE - lenSec - lenKey, quotes);
+    /* call the callback */
+    if (!Callback(LocalBuffer, LocalBuffer + lenSec, LocalBuffer + lenSec + lenKey, UserData))
+      break;
+  }
+
+  (void)ini_close(&fp);
+  return 1;
+}
+#endif /* INI_NOBROWSE */
+
+#if ! defined INI_READONLY
+static void ini_tempname(TCHAR *dest, const TCHAR *source, int maxlength)
+{
+  TCHAR *p;
+
+  ini_strncpy(dest, source, maxlength, QUOTE_NONE);
+  p = _tcschr(dest, '\0');
+  assert(p != NULL);
+  *(p - 1) = '~';
+}
+
+static enum quote_option check_enquote(const TCHAR *Value)
+{
+  const TCHAR *p;
+
+  /* run through the value, if it has trailing spaces, or '"', ';' or '#'
+   * characters, enquote it
+   */
+  assert(Value != NULL);
+  for (p = Value; *p != '\0' && *p != '"' && *p != ';' && *p != '#'; p++)
+    /* nothing */;
+  return (*p != '\0' || (p > Value && *(p - 1) == ' ')) ? QUOTE_ENQUOTE : QUOTE_NONE;
+}
+
+static void writesection(TCHAR *LocalBuffer, const TCHAR *Section, INI_FILETYPE *fp)
+{
+  if (Section != NULL && _tcslen(Section) > 0) {
+    TCHAR *p;
+    LocalBuffer[0] = '[';
+    ini_strncpy(LocalBuffer + 1, Section, INI_BUFFERSIZE - 4, QUOTE_NONE);  /* -1 for '[', -1 for ']', -2 for '\r\n' */
+    p = _tcschr(LocalBuffer, '\0');
+    assert(p != NULL);
+    *p++ = ']';
+    _tcscpy(p, INI_LINETERM); /* copy line terminator (typically "\n") */
+    if (fp != NULL)
+      (void)ini_write(LocalBuffer, fp);
+  }
+}
+
+static void writekey(TCHAR *LocalBuffer, const TCHAR *Key, const TCHAR *Value, INI_FILETYPE *fp)
+{
+  TCHAR *p;
+  enum quote_option option = check_enquote(Value);
+  ini_strncpy(LocalBuffer, Key, INI_BUFFERSIZE - 3, QUOTE_NONE);  /* -1 for '=', -2 for '\r\n' */
+  p = _tcschr(LocalBuffer, '\0');
+  assert(p != NULL);
+  *p++ = '=';
+  ini_strncpy(p, Value, INI_BUFFERSIZE - (p - LocalBuffer) - 2, option); /* -2 for '\r\n' */
+  p = _tcschr(LocalBuffer, '\0');
+  assert(p != NULL);
+  _tcscpy(p, INI_LINETERM); /* copy line terminator (typically "\n") */
+  if (fp != NULL)
+    (void)ini_write(LocalBuffer, fp);
+}
+
+static int cache_accum(const TCHAR *string, int *size, int max)
+{
+  int len = (int)_tcslen(string);
+  if (*size + len >= max)
+    return 0;
+  *size += len;
+  return 1;
+}
+
+static int cache_flush(TCHAR *buffer, int *size,
+                      INI_FILETYPE *rfp, INI_FILETYPE *wfp, INI_FILEPOS *mark)
+{
+  int terminator_len = (int)_tcslen(INI_LINETERM);
+  int pos = 0, pos_prev = -1;
+
+  (void)ini_seek(rfp, mark);
+  assert(buffer != NULL);
+  buffer[0] = '\0';
+  assert(size != NULL);
+  assert(*size <= INI_BUFFERSIZE);
+  while (pos < *size && pos != pos_prev) {
+    pos_prev = pos;     /* to guard against zero bytes in the INI file */
+    (void)ini_read(buffer + pos, INI_BUFFERSIZE - pos, rfp);
+    while (pos < *size && buffer[pos] != '\0')
+      pos++;            /* cannot use _tcslen() because buffer may not be zero-terminated */
+  }
+  if (buffer[0] != '\0') {
+    assert(pos > 0 && pos <= INI_BUFFERSIZE);
+    if (pos == INI_BUFFERSIZE)
+      pos--;
+    buffer[pos] = '\0'; /* force zero-termination (may be left unterminated in the above while loop) */
+    (void)ini_write(buffer, wfp);
+  }
+  ini_tell(rfp, mark);  /* update mark */
+  *size = 0;
+  /* return whether the buffer ended with a line termination */
+  return (pos > terminator_len) && (_tcscmp(buffer + pos - terminator_len, INI_LINETERM) == 0);
+}
+
+static int close_rename(INI_FILETYPE *rfp, INI_FILETYPE *wfp, const TCHAR *filename, TCHAR *buffer)
+{
+  (void)ini_close(rfp);
+  (void)ini_close(wfp);
+  (void)ini_tempname(buffer, filename, INI_BUFFERSIZE);
+  #if defined ini_remove || defined INI_REMOVE
+    (void)ini_remove(filename);
+  #endif
+  (void)ini_rename(buffer, filename);
+  return 1;
+}
+
+/** ini_puts()
+ * \param Section     the name of the section to write the string in
+ * \param Key         the name of the entry to write, or NULL to erase all keys in the section
+ * \param Value       a pointer to the buffer the string, or NULL to erase the key
+ * \param Filename    the name and full path of the .ini file to write to
+ *
+ * \return            1 if successful, otherwise 0
+ */
+int ini_puts(const TCHAR *Section, const TCHAR *Key, const TCHAR *Value, const TCHAR *Filename)
+{
+  INI_FILETYPE rfp;
+  INI_FILETYPE wfp;
+  INI_FILEPOS mark;
+  INI_FILEPOS head, tail;
+  TCHAR *sp, *ep;
+  TCHAR LocalBuffer[INI_BUFFERSIZE];
+  int len, match, flag, cachelen;
+
+  assert(Filename != NULL);
+  if (!ini_openread(Filename, &rfp)) {
+    /* If the .ini file doesn't exist, make a new file */
+    if (Key != NULL && Value != NULL) {
+      if (!ini_openwrite(Filename, &wfp))
+        return 0;
+      writesection(LocalBuffer, Section, &wfp);
+      writekey(LocalBuffer, Key, Value, &wfp);
+      (void)ini_close(&wfp);
+    }
+    return 1;
+  }
+
+  /* If parameters Key and Value are valid (so this is not an "erase" request)
+   * and the setting already exists, there are two short-cuts to avoid rewriting
+   * the INI file.
+   */
+  if (Key != NULL && Value != NULL) {
+    match = getkeystring(&rfp, Section, Key, -1, -1, LocalBuffer, sizearray(LocalBuffer), &head);
+    if (match) {
+      /* if the current setting is identical to the one to write, there is
+       * nothing to do.
+       */
+      if (_tcscmp(LocalBuffer,Value) == 0) {
+        (void)ini_close(&rfp);
+        return 1;
+      }
+      /* if the new setting has the same length as the current setting, and the
+       * glue file permits file read/write access, we can modify in place.
+       */
+      #if defined ini_openrewrite || defined INI_OPENREWRITE
+        /* we already have the start of the (raw) line, get the end too */
+        ini_tell(&rfp, &tail);
+        /* create new buffer (without writing it to file) */
+        writekey(LocalBuffer, Key, Value, NULL);
+        if (_tcslen(LocalBuffer) == (size_t)(tail - head)) {
+          /* length matches, close the file & re-open for read/write, then
+           * write at the correct position
+           */
+          (void)ini_close(&rfp);
+          if (!ini_openrewrite(Filename, &wfp))
+            return 0;
+          (void)ini_seek(&wfp, &head);
+          (void)ini_write(LocalBuffer, &wfp);
+          (void)ini_close(&wfp);
+          return 1;
+        }
+      #endif
+    }
+    /* key not found, or different value & length -> proceed */
+  } else if (Key != NULL && Value == NULL) {
+    /* Conversely, for a request to delete a setting; if that setting isn't
+       present, just return */
+    match = getkeystring(&rfp, Section, Key, -1, -1, LocalBuffer, sizearray(LocalBuffer), NULL);
+    if (!match) {
+      (void)ini_close(&rfp);
+      return 1;
+    }
+    /* key found -> proceed to delete it */
+  }
+
+  /* Get a temporary file name to copy to. Use the existing name, but with
+   * the last character set to a '~'.
+   */
+  (void)ini_close(&rfp);
+  ini_tempname(LocalBuffer, Filename, INI_BUFFERSIZE);
+  if (!ini_openwrite(LocalBuffer, &wfp))
+    return 0;
+  /* In the case of (advisory) file locks, ini_openwrite() may have been blocked
+   * on the open, and after the block is lifted, the original file may have been
+   * renamed, which is why the original file was closed and is now reopened */
+  if (!ini_openread(Filename, &rfp)) {
+    /* If the .ini file doesn't exist any more, make a new file */
+    assert(Key != NULL && Value != NULL);
+    writesection(LocalBuffer, Section, &wfp);
+    writekey(LocalBuffer, Key, Value, &wfp);
+    (void)ini_close(&wfp);
+    return 1;
+  }
+
+  (void)ini_tell(&rfp, &mark);
+  cachelen = 0;
+
+  /* Move through the file one line at a time until a section is
+   * matched or until EOF. Copy to temp file as it is read.
+   */
+  len = (Section != NULL) ? (int)_tcslen(Section) : 0;
+  if (len > 0) {
+    do {
+      if (!ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp)) {
+        /* Failed to find section, so add one to the end */
+        flag = cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+        if (Key!=NULL && Value!=NULL) {
+          if (!flag)
+            (void)ini_write(INI_LINETERM, &wfp);  /* force a new line behind the last line of the INI file */
+          writesection(LocalBuffer, Section, &wfp);
+          writekey(LocalBuffer, Key, Value, &wfp);
+        }
+        return close_rename(&rfp, &wfp, Filename, LocalBuffer);  /* clean up and rename */
+      }
+      /* Check whether this line is a section */
+      sp = skipleading(LocalBuffer);
+      ep = _tcsrchr(sp, ']');
+      match = (*sp == '[' && ep != NULL);
+      if (match) {
+        /* A section was found, skip leading and trailing whitespace */
+        assert(sp != NULL && *sp == '[');
+        sp = skipleading(sp + 1);
+        assert(ep != NULL && *ep == ']');
+        ep = skiptrailing(ep, sp);
+        match = ((int)(ep-sp) == len && _tcsnicmp(sp, Section, len) == 0);
+      }
+      /* Copy the line from source to dest, but not if this is the section that
+       * we are looking for and this section must be removed
+       */
+      if (!match || Key != NULL) {
+        if (!cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE)) {
+          cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+          (void)ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp);
+          cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE);
+        }
+      }
+    } while (!match);
+  }
+  cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+  /* when deleting a section, the section head that was just found has not been
+   * copied to the output file, but because this line was not "accumulated" in
+   * the cache, the position in the input file was reset to the point just
+   * before the section; this must now be skipped (again)
+   */
+  if (Key == NULL) {
+    (void)ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp);
+    (void)ini_tell(&rfp, &mark);
+  }
+
+  /* Now that the section has been found, find the entry. Stop searching
+   * upon leaving the section's area. Copy the file as it is read
+   * and create an entry if one is not found.
+   */
+  len = (Key != NULL) ? (int)_tcslen(Key) : 0;
+  for( ;; ) {
+    if (!ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp)) {
+      /* EOF without an entry so make one */
+      flag = cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+      if (Key!=NULL && Value!=NULL) {
+        if (!flag)
+          (void)ini_write(INI_LINETERM, &wfp);  /* force a new line behind the last line of the INI file */
+        writekey(LocalBuffer, Key, Value, &wfp);
+      }
+      return close_rename(&rfp, &wfp, Filename, LocalBuffer);  /* clean up and rename */
+    }
+    sp = skipleading(LocalBuffer);
+    ep = _tcschr(sp, '='); /* Parse out the equal sign */
+    if (ep == NULL)
+      ep = _tcschr(sp, ':');
+    match = (ep != NULL && len > 0 && (int)(skiptrailing(ep,sp)-sp) == len && _tcsnicmp(sp,Key,len) == 0);
+    if ((Key != NULL && match) || *sp == '[')
+      break;  /* found the key, or found a new section */
+    /* copy other keys in the section */
+    if (Key == NULL) {
+      (void)ini_tell(&rfp, &mark);  /* we are deleting the entire section, so update the read position */
+    } else {
+      if (!cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE)) {
+        cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+        (void)ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp);
+        cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE);
+      }
+    }
+  }
+  /* the key was found, or we just dropped on the next section (meaning that it
+   * wasn't found); in both cases we need to write the key, but in the latter
+   * case, we also need to write the line starting the new section after writing
+   * the key
+   */
+  flag = (*sp == '[');
+  cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+  if (Key != NULL && Value != NULL)
+    writekey(LocalBuffer, Key, Value, &wfp);
+  /* cache_flush() reset the "read pointer" to the start of the line with the
+   * previous key or the new section; read it again (because writekey() destroyed
+   * the buffer)
+   */
+  (void)ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp);
+  if (flag) {
+    /* the new section heading needs to be copied to the output file */
+    cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE);
+  } else {
+    /* forget the old key line */
+    (void)ini_tell(&rfp, &mark);
+  }
+  /* Copy the rest of the INI file */
+  while (ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp)) {
+    if (!cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE)) {
+      cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+      (void)ini_read(LocalBuffer, INI_BUFFERSIZE, &rfp);
+      cache_accum(LocalBuffer, &cachelen, INI_BUFFERSIZE);
+    }
+  }
+  cache_flush(LocalBuffer, &cachelen, &rfp, &wfp, &mark);
+  return close_rename(&rfp, &wfp, Filename, LocalBuffer);  /* clean up and rename */
+}
+
+/* Ansi C "itoa" based on Kernighan & Ritchie's "Ansi C" book. */
+#define ABS(v)  ((v) < 0 ? -(v) : (v))
+
+static void strreverse(TCHAR *str)
+{
+  int i, j;
+  for (i = 0, j = (int)_tcslen(str) - 1; i < j; i++, j--) {
+    TCHAR t = str[i];
+    str[i] = str[j];
+    str[j] = t;
+  }
+}
+
+static void long2str(long value, TCHAR *str)
+{
+  int i = 0;
+  long sign = value;
+
+  /* generate digits in reverse order */
+  do {
+    int n = (int)(value % 10);          /* get next lowest digit */
+    str[i++] = (TCHAR)(ABS(n) + '0');   /* handle case of negative digit */
+  } while (value /= 10);                /* delete the lowest digit */
+  if (sign < 0)
+    str[i++] = '-';
+  str[i] = '\0';
+
+  strreverse(str);
+}
+
+/** ini_putl()
+ * \param Section     the name of the section to write the value in
+ * \param Key         the name of the entry to write
+ * \param Value       the value to write
+ * \param Filename    the name and full path of the .ini file to write to
+ *
+ * \return            1 if successful, otherwise 0
+ */
+int ini_putl(const TCHAR *Section, const TCHAR *Key, long Value, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[32];
+  long2str(Value, LocalBuffer);
+  return ini_puts(Section, Key, LocalBuffer, Filename);
+}
+
+#if defined INI_REAL
+/** ini_putf()
+ * \param Section     the name of the section to write the value in
+ * \param Key         the name of the entry to write
+ * \param Value       the value to write
+ * \param Filename    the name and full path of the .ini file to write to
+ *
+ * \return            1 if successful, otherwise 0
+ */
+int ini_putf(const TCHAR *Section, const TCHAR *Key, INI_REAL Value, const TCHAR *Filename)
+{
+  TCHAR LocalBuffer[64];
+  ini_ftoa(LocalBuffer, Value);
+  return ini_puts(Section, Key, LocalBuffer, Filename);
+}
+#endif /* INI_REAL */
+#endif /* !INI_READONLY */

lib/minIni/minIni.h

@@ -0,0 +1,166 @@
+/*  minIni - Multi-Platform INI file parser, suitable for embedded systems
+ *
+ *  Copyright (c) CompuPhase, 2008-2021
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ *  use this file except in compliance with the License. You may obtain a copy
+ *  of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ *
+ *  Version: $Id: minIni.h 53 2015-01-18 13:35:11Z thiadmer.riemersma@gmail.com $
+ */
+#ifndef MININI_H
+#define MININI_H
+
+#include "minGlue.h"
+
+#if (defined _UNICODE || defined __UNICODE__ || defined UNICODE) && !defined INI_ANSIONLY
+  #include <tchar.h>
+  #define mTCHAR TCHAR
+#else
+  /* force TCHAR to be "char", but only for minIni */
+  #define mTCHAR char
+#endif
+
+#if !defined INI_BUFFERSIZE
+  #define INI_BUFFERSIZE  512
+#endif
+
+#if defined __cplusplus
+  extern "C" {
+#endif
+
+int   ini_getbool(const mTCHAR *Section, const mTCHAR *Key, int DefValue, const mTCHAR *Filename);
+long  ini_getl(const mTCHAR *Section, const mTCHAR *Key, long DefValue, const mTCHAR *Filename);
+int   ini_gets(const mTCHAR *Section, const mTCHAR *Key, const mTCHAR *DefValue, mTCHAR *Buffer, int BufferSize, const mTCHAR *Filename);
+int   ini_getsection(int idx, mTCHAR *Buffer, int BufferSize, const mTCHAR *Filename);
+int   ini_getkey(const mTCHAR *Section, int idx, mTCHAR *Buffer, int BufferSize, const mTCHAR *Filename);
+
+int   ini_hassection(const mTCHAR *Section, const mTCHAR *Filename);
+int   ini_haskey(const mTCHAR *Section, const mTCHAR *Key, const mTCHAR *Filename);
+
+#if defined INI_REAL
+INI_REAL ini_getf(const mTCHAR *Section, const mTCHAR *Key, INI_REAL DefValue, const mTCHAR *Filename);
+#endif
+
+#if !defined INI_READONLY
+int   ini_putl(const mTCHAR *Section, const mTCHAR *Key, long Value, const mTCHAR *Filename);
+int   ini_puts(const mTCHAR *Section, const mTCHAR *Key, const mTCHAR *Value, const mTCHAR *Filename);
+#if defined INI_REAL
+int   ini_putf(const mTCHAR *Section, const mTCHAR *Key, INI_REAL Value, const mTCHAR *Filename);
+#endif
+#endif /* INI_READONLY */
+
+#if !defined INI_NOBROWSE
+typedef int (*INI_CALLBACK)(const mTCHAR *Section, const mTCHAR *Key, const mTCHAR *Value, void *UserData);
+int  ini_browse(INI_CALLBACK Callback, void *UserData, const mTCHAR *Filename);
+#endif /* INI_NOBROWSE */
+
+#if defined __cplusplus
+  }
+#endif
+
+
+#if defined __cplusplus
+
+#if defined __WXWINDOWS__
+	#include "wxMinIni.h"
+#else
+  #include <string>
+
+  /* The C++ class in minIni.h was contributed by Steven Van Ingelgem. */
+  class minIni
+  {
+  public:
+    minIni(const std::string& filename) : iniFilename(filename)
+      { }
+
+    bool getbool(const std::string& Section, const std::string& Key, bool DefValue=false) const
+      { return ini_getbool(Section.c_str(), Key.c_str(), int(DefValue), iniFilename.c_str()) != 0; }
+
+    long getl(const std::string& Section, const std::string& Key, long DefValue=0) const
+      { return ini_getl(Section.c_str(), Key.c_str(), DefValue, iniFilename.c_str()); }
+
+    int geti(const std::string& Section, const std::string& Key, int DefValue=0) const
+      { return static_cast<int>(this->getl(Section, Key, long(DefValue))); }
+
+    std::string gets(const std::string& Section, const std::string& Key, const std::string& DefValue="") const
+      {
+        char buffer[INI_BUFFERSIZE];
+        ini_gets(Section.c_str(), Key.c_str(), DefValue.c_str(), buffer, INI_BUFFERSIZE, iniFilename.c_str());
+        return buffer;
+      }
+
+    std::string getsection(int idx) const
+      {
+        char buffer[INI_BUFFERSIZE];
+        ini_getsection(idx, buffer, INI_BUFFERSIZE, iniFilename.c_str());
+        return buffer;
+      }
+
+    std::string getkey(const std::string& Section, int idx) const
+      {
+        char buffer[INI_BUFFERSIZE];
+        ini_getkey(Section.c_str(), idx, buffer, INI_BUFFERSIZE, iniFilename.c_str());
+        return buffer;
+      }
+
+    bool hassection(const std::string& Section) const
+      { return ini_hassection(Section.c_str(), iniFilename.c_str()) != 0; }
+
+    bool haskey(const std::string& Section, const std::string& Key) const
+      { return ini_haskey(Section.c_str(), Key.c_str(), iniFilename.c_str()) != 0; }
+
+#if defined INI_REAL
+    INI_REAL getf(const std::string& Section, const std::string& Key, INI_REAL DefValue=0) const
+      { return ini_getf(Section.c_str(), Key.c_str(), DefValue, iniFilename.c_str()); }
+#endif
+
+#if ! defined INI_READONLY
+    bool put(const std::string& Section, const std::string& Key, long Value)
+      { return ini_putl(Section.c_str(), Key.c_str(), Value, iniFilename.c_str()) != 0; }
+
+    bool put(const std::string& Section, const std::string& Key, int Value)
+      { return ini_putl(Section.c_str(), Key.c_str(), (long)Value, iniFilename.c_str()) != 0; }
+
+    bool put(const std::string& Section, const std::string& Key, bool Value)
+      { return ini_putl(Section.c_str(), Key.c_str(), (long)Value, iniFilename.c_str()) != 0; }
+
+    bool put(const std::string& Section, const std::string& Key, const std::string& Value)
+      { return ini_puts(Section.c_str(), Key.c_str(), Value.c_str(), iniFilename.c_str()) != 0; }
+
+    bool put(const std::string& Section, const std::string& Key, const char* Value)
+      { return ini_puts(Section.c_str(), Key.c_str(), Value, iniFilename.c_str()) != 0; }
+
+#if defined INI_REAL
+    bool put(const std::string& Section, const std::string& Key, INI_REAL Value)
+      { return ini_putf(Section.c_str(), Key.c_str(), Value, iniFilename.c_str()) != 0; }
+#endif
+
+    bool del(const std::string& Section, const std::string& Key)
+      { return ini_puts(Section.c_str(), Key.c_str(), 0, iniFilename.c_str()) != 0; }
+
+    bool del(const std::string& Section)
+      { return ini_puts(Section.c_str(), 0, 0, iniFilename.c_str()) != 0; }
+#endif
+
+#if !defined INI_NOBROWSE
+    bool browse(INI_CALLBACK Callback, void *UserData) const
+      { return ini_browse(Callback, UserData, iniFilename.c_str()) != 0; }
+#endif
+
+  private:
+    std::string iniFilename;
+  };
+
+#endif /* __WXWINDOWS__ */
+#endif /* __cplusplus */
+
+#endif /* MININI_H */

platformio.ini

@@ -7,6 +7,7 @@ default_envs = STM32F1
 framework = arduino
 lib_deps =
     greiman/SdFat @ 2.2.0
+    miniIni
 upload_protocol = stlink
 ; Different gcc versions produce much different binaries in terms of speed.
 platform_packages = platformio/toolchain-gccarmnoneeabi@1.90301.200702