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Handle unprintable characters more gracefully

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* Skip UTF-8 byte order mark at beginning of file
* Error on other unexpected unprintable characters
This commit is contained in:
dbrotz
2019-06-29 12:50:41 -07:00
parent 1decf5d0d4
commit 484d15dbb2
3 changed files with 32 additions and 12 deletions
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38
src/asm/lexer.c
View File

@@ -38,6 +38,8 @@ struct sLexString {
#define SAFETYMARGIN 1024
#define BOM_SIZE 3
struct sLexFloat tLexFloat[32];
struct sLexString *tLexHash[LEXHASHSIZE];
YY_BUFFER_STATE pCurrentBuffer;
@@ -49,6 +51,9 @@ uint32_t tFloatingChars[256];
uint32_t nFloating;
enum eLexerState lexerstate = LEX_STATE_NORMAL;
/* UTF-8 byte order mark */
static const unsigned char bom[BOM_SIZE] = { 0xEF, 0xBB, 0xBF };
void upperstring(char *s)
{
while (*s) {
@@ -120,11 +125,11 @@ void yy_delete_buffer(YY_BUFFER_STATE buf)
*/
static void yy_buffer_append(YY_BUFFER_STATE buf, uint32_t capacity, char c)
{
assert(buf->pBuffer[buf->nBufferSize] == 0);
assert(buf->pBufferStart[buf->nBufferSize] == 0);
assert(buf->nBufferSize + 1 < capacity);
buf->pBuffer[buf->nBufferSize++] = c;
buf->pBuffer[buf->nBufferSize] = 0;
buf->pBufferStart[buf->nBufferSize++] = c;
buf->pBufferStart[buf->nBufferSize] = 0;
}
YY_BUFFER_STATE yy_scan_bytes(char *mem, uint32_t size)
@@ -221,6 +226,11 @@ YY_BUFFER_STATE yy_create_buffer(FILE *f)
*/
capacity += 3;
/* Skip UTF-8 byte order mark. */
if (pBuffer->nBufferSize >= BOM_SIZE
&& !memcmp(pBuffer->pBuffer, bom, BOM_SIZE))
pBuffer->pBuffer += BOM_SIZE;
/* Convert all line endings to LF and spaces */
char *mem = pBuffer->pBuffer;
@@ -281,7 +291,7 @@ YY_BUFFER_STATE yy_create_buffer(FILE *f)
}
/* Add newline if file doesn't end with one */
if (size == 0 || pBuffer->pBuffer[size - 1] != '\n')
if (size == 0 || pBuffer->pBufferStart[size - 1] != '\n')
yy_buffer_append(pBuffer, capacity, '\n');
/* Add newline if \ will eat the last newline */
@@ -289,10 +299,10 @@ YY_BUFFER_STATE yy_create_buffer(FILE *f)
size_t pos = pBuffer->nBufferSize - 2;
/* Skip spaces */
while (pos > 0 && pBuffer->pBuffer[pos] == ' ')
while (pos > 0 && pBuffer->pBufferStart[pos] == ' ')
pos--;
if (pBuffer->pBuffer[pos] == '\\')
if (pBuffer->pBufferStart[pos] == '\\')
yy_buffer_append(pBuffer, capacity, '\n');
}
@@ -783,10 +793,22 @@ scanagain:
* numeric literal, string, or bracketed symbol, so just return
* the ASCII character.
*/
if (*pLexBuffer == '\n')
unsigned char ch = *pLexBuffer++;
if (ch == '\n')
AtLineStart = 1;
return *pLexBuffer++;
/*
* Check for invalid unprintable characters.
* They may not be readily apparent in a text editor,
* so this is useful for identifying encoding problems.
*/
if (ch != 0
&& ch != '\n'
&& !(ch >= 0x20 && ch <= 0x7E))
fatalerror("Found garbage character: 0x%02X", ch);
return ch;
}
if (pLongestFixed == NULL || nFloatLen > pLongestFixed->nNameLength) {

3
test/asm/garbage_char.out
View File

@@ -1,3 +1,2 @@
ERROR: garbage_char.asm(1):
syntax error
error: Assembly aborted (1 errors)!
Found garbage character: 0xFF

3
test/asm/garbage_char.out.pipe
View File

@@ -1,3 +1,2 @@
ERROR: -(1):
syntax error
error: Assembly aborted (1 errors)!
Found garbage character: 0xFF