Perform case insensitive search of partition types

cgdisk.8

@@ -263,9 +263,9 @@ two\-byte hexadecimal number. You may also enter a GUID directly, if you
 have one and \fBcgdisk\fR doesn't know it. If you don't know the type code
 for your partition, you can type \fBL\fR to see a list of known type codes.
 The type code list may optionally be filtered by a search string; for
-instance, entering \fI\fBLinux\fR\fR shows only partition type codes with
+instance, entering \fI\fBlinux\fR\fR shows only partition type codes with
 descriptions that include the string \fILinux\fR. This search is performed
-case\-sensitively.
+case\-insensitively.
 
 .TP 
 .B Verify

gdisk.8

@@ -191,9 +191,9 @@ more codes in GPT. For these, \fBgdisk\fR adds code numbers sequentially,
 such as 0xa500 for a FreeBSD disklabel, 0xa501 for FreeBSD boot, 0xa502 for
 FreeBSD swap, and so on. Note that these two\-byte codes are unique to
 \fBgdisk\fR. The type code list may optionally be filtered by a search
-string; for instance, entering \fI\fBLinux\fR\fR shows only partition type
+string; for instance, entering \fI\fBlinux\fR\fR shows only partition type
 codes with descriptions that include the string \fILinux\fR. This search is
-performed case\-sensitively.
+performed case\-insensitively.
 
 .TP 
 .B n

parttypes.cc

@@ -510,10 +510,10 @@ void PartType::ShowAllTypes(int maxLines) const {
    cout.unsetf(ios::uppercase);
    if (maxLines > 0) {
       cout << "Type search string, or <Enter> to show all codes: ";
-      matchString = ReadString();
+      matchString = ToLower(ReadString());
    } // if
    while (thisType != NULL) {
-      found = thisType->name.find(matchString);
+      found = ToLower(thisType->name).find(matchString);
       if ((thisType->display == 1) && (found != string::npos)) { // show it
          cout.fill('0');
          cout.width(4);

support.cc

@@ -16,6 +16,8 @@
 #include <string.h>
 #include <sys/stat.h>
 #include <string>
+#include <cctype>
+#include <algorithm>
 #include <iostream>
 #include <sstream>
 #include "support.h"
@@ -357,3 +359,11 @@ void WinWarning(void) {
       exit(0);
    #endif
 } // WinWarning()
+
+// Returns the input string in lower case
+string ToLower(const string& input) {
+   string lower = input; // allocate correct size through copy
+
+   transform(input.begin(), input.end(), lower.begin(), ::tolower);
+   return lower;
+} // ToLower()

support.h

@@ -82,5 +82,6 @@ int IsHex(string input); // Returns 1 if input can be hexadecimal number....
 int IsLittleEndian(void); // Returns 1 if CPU is little-endian, 0 if it's big-endian
 void ReverseBytes(void* theValue, int numBytes); // Reverses byte-order of theValue
 void WinWarning(void);
+string ToLower(const string& input);
 
 #endif