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[wpiutil] StringExtras: Add substr() (#3742)

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Unlike std::string and std::string_view, this substr() allows a start
greater than the length of the string, in which case an empty string
is returned.  This matches llvm::StringRef behavior.
This commit is contained in:
Peter Johnson
2021-11-27 21:31:40 -08:00
committed by GitHub
parent 6f51cb3b98
commit ae208d2b17
18 changed files with 118 additions and 77 deletions
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3
cscore/src/main/native/linux/UsbCameraProperty.cpp
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@@ -6,6 +6,7 @@
#include <fmt/format.h>
#include <wpi/SmallString.h>
#include <wpi/StringExtras.h>
#include "UsbUtil.h"
@@ -93,7 +94,7 @@ static int GetStringCtrlIoctl(int fd, int id, int maximum, std::string* value) {
static int SetStringCtrlIoctl(int fd, int id, int maximum,
std::string_view value) {
wpi::SmallString<64> str{value.substr(0, maximum)};
wpi::SmallString<64> str{wpi::substr(value, 0, maximum)};
struct v4l2_ext_control ctrl;
struct v4l2_ext_controls ctrls;