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Add str find first occurence, fix array pop logic

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Array pop was incorrectly returning the last element which is now an invalid ptr
to data.
This commit is contained in:
Doyle Thai 2017-05-04 00:22:30 +10:00
parent 2203e9b4f2
commit 116861d888
1 changed files with 47 additions and 66 deletions
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107
dqn.h
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@ -70,6 +70,7 @@ typedef float f32;
// DArray - Dynamic Array // DArray - Dynamic Array
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
// REMINDER: Dynamic Array can be used as a stack. Don't need to create one. // REMINDER: Dynamic Array can be used as a stack. Don't need to create one.
// TODO(doyle): Custom allocator
#if 1 #if 1
template <typename T> template <typename T>
struct DqnArray struct DqnArray
@ -105,8 +106,7 @@ bool DqnArray_Init(DqnArray<T> *array, size_t capacity)
if (!DqnArray_Free(array)) return false; if (!DqnArray_Free(array)) return false;
} }
array->data = array->data = (T *)Dqn_MemAllocInternal((size_t)capacity * sizeof(T), true);
(T *)Dqn_MemAllocInternal((size_t)capacity * sizeof(T), true);
if (!array->data) return false; if (!array->data) return false;
array->count = 0; array->count = 0;
@ -123,8 +123,8 @@ bool DqnArray_Grow(DqnArray<T> *array)
size_t newCapacity = (size_t)(array->capacity * GROWTH_FACTOR); size_t newCapacity = (size_t)(array->capacity * GROWTH_FACTOR);
if (newCapacity == array->capacity) newCapacity++; if (newCapacity == array->capacity) newCapacity++;
T *newMem = (T *)Dqn_MemReallocInternal( T *newMem = (T *)Dqn_MemReallocInternal(array->data,
array->data, (size_t)(newCapacity * sizeof(T))); (size_t)(newCapacity * sizeof(T)));
if (newMem) if (newMem)
{ {
array->data = newMem; array->data = newMem;
@ -154,13 +154,13 @@ T *DqnArray_Push(DqnArray<T> *array, T item)
} }
template <typename T> template <typename T>
T *DqnArray_Pop(DqnArray<T> *array) void DqnArray_Pop(DqnArray<T> *array)
{ {
if (!array) return NULL; if (!array) return;
if (array->count == 0) return NULL; if (array->count == 0) return;
array->count--;
T *result = &array->data[--array->count]; return;
return result;
} }
template <typename T> template <typename T>
@ -442,8 +442,8 @@ DQN_FILE_SCOPE char *Dqn_strncpy (char *dest, const char *src, i32 numC
#define DQN_I32_TO_STR_MAX_BUF_SIZE 11 #define DQN_I32_TO_STR_MAX_BUF_SIZE 11
DQN_FILE_SCOPE bool Dqn_StrReverse (char *buf, const i32 bufSize); DQN_FILE_SCOPE bool Dqn_StrReverse (char *buf, const i32 bufSize);
DQN_FILE_SCOPE bool Dqn_StrHasSubstring(const char *const a, const i32 lenA, DQN_FILE_SCOPE i32 Dqn_StrFindFirstOccurence(const char *const src, const i32 srcLen, const char *const find, const i32 findLen);
const char *const b, const i32 lenB); DQN_FILE_SCOPE bool Dqn_StrHasSubstring (const char *const src, const i32 srcLen, const char *const find, const i32 findLen);
DQN_FILE_SCOPE i32 Dqn_StrToI32(const char *const buf, const i32 bufSize); DQN_FILE_SCOPE i32 Dqn_StrToI32(const char *const buf, const i32 bufSize);
// Return the len of the derived string // Return the len of the derived string
@ -515,22 +515,13 @@ typedef struct DqnFile
} DqnFile; } DqnFile;
// Open a handle to the file // Open a handle to the file
DQN_FILE_SCOPE bool DqnFile_Open(const char *const path, DqnFile *const file, DQN_FILE_SCOPE bool DqnFile_Open (const char *const path, DqnFile *const file, const u32 permissionFlags, const enum DqnFileAction action);
const u32 permissionFlags, DQN_FILE_SCOPE bool DqnFile_OpenW(const wchar_t *const path, DqnFile *const file, const u32 permissionFlags, const enum DqnFileAction action);
const enum DqnFileAction action);
DQN_FILE_SCOPE bool DqnFile_OpenW(const wchar_t *const path, DqnFile *const file,
const u32 permissionFlags,
const enum DqnFileAction action);
// File offset is the byte offset to starting writing from // File offset is the byte offset to starting writing from
DQN_FILE_SCOPE size_t DqnFile_Write(const DqnFile *const file, DQN_FILE_SCOPE size_t DqnFile_Write(const DqnFile *const file, const u8 *const buffer, const size_t numBytesToWrite, const size_t fileOffset);
const u8 *const buffer,
const size_t numBytesToWrite,
const size_t fileOffset);
// Return the number of bytes read // Return the number of bytes read
DQN_FILE_SCOPE size_t DqnFile_Read(const DqnFile file, const u8 *const buffer, DQN_FILE_SCOPE size_t DqnFile_Read (const DqnFile file, const u8 *const buffer, const size_t numBytesToRead);
const size_t numBytesToRead);
DQN_FILE_SCOPE void DqnFile_Close(DqnFile *const file); DQN_FILE_SCOPE void DqnFile_Close(DqnFile *const file);
// Return an array of strings of the files in the directory in UTF-8. numFiles // Return an array of strings of the files in the directory in UTF-8. numFiles
@ -1027,7 +1018,7 @@ zero-terminated. If `length` is zero, the length is determined automatically,
#ifndef STB_SPRINTF_H_INCLUDE #ifndef STB_SPRINTF_H_INCLUDE
#define STB_SPRINTF_H_INCLUDE #define STB_SPRINTF_H_INCLUDE
#define STB_SPRINTF_DECORATE(name) dqn_##name #define STB_SPRINTF_DECORATE(name) Dqn_##name
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
// STB_Sprintf renamed to Dqn_Sprintf // STB_Sprintf renamed to Dqn_Sprintf
@ -1358,7 +1349,7 @@ DQN_FILE_SCOPE bool DqnV2_Overlaps(DqnV2 a, DqnV2 b)
DQN_FILE_SCOPE DqnV2 DqnV2_Perpendicular(DqnV2 a) DQN_FILE_SCOPE DqnV2 DqnV2_Perpendicular(DqnV2 a)
{ {
DqnV2 result = {a.y, -a.x}; DqnV2 result = DqnV2_2f(a.y, -a.x);
return result; return result;
} }
@ -1908,53 +1899,32 @@ DQN_FILE_SCOPE bool Dqn_StrReverse(char *buf, const i32 bufSize)
return true; return true;
} }
DQN_FILE_SCOPE bool Dqn_StrHasSubstring(const char *const a, const i32 lenA, DQN_FILE_SCOPE i32 Dqn_StrFindFirstOccurence(const char *const src, const i32 srcLen,
const char *const b, const i32 lenB) const char *const find, const i32 findLen)
{ {
if (!a || !b) return false; if (!src || !find) return -1;
if (lenA == 0 || lenB == 0) return false; if (srcLen == 0 || findLen == 0) return -1;
if (srcLen < findLen) return -1;
const char *longStr, *shortStr; for (i32 indexIntoSrc = 0; indexIntoSrc < srcLen; indexIntoSrc++)
i32 longLen, shortLen;
if (lenA > lenB)
{ {
longStr = a; // NOTE: As we scan through, if the src string we index into becomes
longLen = lenA;
shortStr = b;
shortLen = lenB;
}
else
{
longStr = b;
longLen = lenB;
shortStr = a;
shortLen = lenA;
}
bool matchedSubstr = false;
for (i32 indexIntoLong = 0; indexIntoLong < longLen && !matchedSubstr;
indexIntoLong++)
{
// NOTE: As we scan through, if the longer string we index into becomes
// shorter than the substring we're checking then the substring is not // shorter than the substring we're checking then the substring is not
// contained in the long string. // contained in the src string.
i32 remainingLenInLongStr = longLen - indexIntoLong; i32 remainingLenInSrcStr = srcLen - indexIntoSrc;
if (remainingLenInLongStr < shortLen) break; if (remainingLenInSrcStr < findLen) break;
const char *longSubstr = &longStr[indexIntoLong]; const char *srcSubStr = &src[indexIntoSrc];
i32 index = 0; i32 index = 0;
for (;;) for (;;)
{ {
if (DqnChar_ToLower(longSubstr[index]) == if (DqnChar_ToLower(srcSubStr[index]) ==
DqnChar_ToLower(shortStr[index])) DqnChar_ToLower(find[index]))
{ {
index++; index++;
if (index >= shortLen || !shortStr[index]) if (index >= findLen || !find[index])
{ {
matchedSubstr = true; return indexIntoSrc;
break;
} }
} }
else else
@ -1964,7 +1934,18 @@ DQN_FILE_SCOPE bool Dqn_StrHasSubstring(const char *const a, const i32 lenA,
} }
} }
return matchedSubstr; // NOTE(doyle): We have early exit, if we reach here, then the substring was
// not found.
return -1;
}
DQN_FILE_SCOPE bool Dqn_StrHasSubstring(const char *const src, const i32 srcLen,
const char *const find, const i32 findLen)
{
if (Dqn_StrFindFirstOccurence(src, srcLen, find, findLen) == -1)
return false;
return true;
} }
DQN_FILE_SCOPE i32 Dqn_StrToI32(const char *const buf, const i32 bufSize) DQN_FILE_SCOPE i32 Dqn_StrToI32(const char *const buf, const i32 bufSize)