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- /*
- *******************************************************************************
- * *
- * COPYRIGHT: *
- * (C) Copyright International Business Machines Corporation, 1998 *
- * Licensed Material - Program-Property of IBM - All Rights Reserved. *
- * US Government Users Restricted Rights - Use, duplication, or disclosure *
- * restricted by GSA ADP Schedule Contract with IBM Corp. *
- * *
- *******************************************************************************
- *
- * File ustdio.c
- *
- * Modification History:
- *
- * Date Name Description
- * 11/18/98 stephen Creation.
- * 03/12/99 stephen Modified for new C API.
- * 07/19/99 stephen Fixed read() and gets()
- *******************************************************************************
- */
-
- #include "ustdio.h"
- #include "ufile.h"
- #include "ufmt_cmn.h"
- #include "ucnv.h"
- #include "ustring.h"
-
- #include <string.h>
-
- static const UChar DELIMITERS [] = { 0x000A, 0x0000 };
-
- #define DELIM_CR 0x000D
- #define DELIM_LF 0x000A
-
- #define IS_STRING_DELIMITER(s) (bool_t)( (s) == DELIM_CR || \
- (s) == DELIM_LF )
-
-
- /* Input/output */
-
- int32_t
- u_fputs(const UChar *s,
- UFILE *f)
- {
- int32_t count = u_file_write(s, u_strlen(s), f);
- count += u_file_write(DELIMITERS, u_strlen(DELIMITERS), f);
- return count;
- }
-
- int32_t
- u_fputc(UChar uc,
- UFILE *f)
- {
- return u_file_write(&uc, 1, f) == 1 ? uc : EOF;
- }
-
- int32_t
- u_file_write( const UChar *chars,
- int32_t count,
- UFILE *f)
- {
- /* Set up conversion parameters */
- UErrorCode status = U_ZERO_ERROR;
- const UChar *mySource = chars;
- const UChar *sourceAlias = chars;
- const UChar *mySourceEnd = chars + count;
- char *myTarget = f->fCharBuffer;
- int32_t bufferSize = UFILE_CHARBUFFER_SIZE;
- int32_t written = 0;
-
- /* Perform the conversion in a loop */
- do {
- status = U_ZERO_ERROR;
- sourceAlias = mySource;
-
- ucnv_fromUnicode(f->fConverter,
- &myTarget,
- f->fCharBuffer + bufferSize,
- &mySource,
- mySourceEnd,
- NULL,
- TRUE,
- &status);
-
- /* write the converted bytes */
- fwrite(f->fCharBuffer,
- sizeof(char),
- myTarget - f->fCharBuffer,
- f->fFile);
-
- written += (myTarget - f->fCharBuffer);
- myTarget = f->fCharBuffer;
- }
- while(status == U_INDEX_OUTOFBOUNDS_ERROR);
-
- /* return # of chars written */
- return written;
- }
-
- /* private function used for buffering input */
- void
- ufile_fill_uchar_buffer(UFILE *f)
- {
- UErrorCode status;
- const char *mySource;
- const char *mySourceEnd;
- UChar *myTarget;
- int32_t bufferSize;
- int32_t maxCPBytes;
- int32_t bytesRead;
- int32_t availLength;
- int32_t dataSize;
-
-
- /* shift the buffer if it isn't empty */
- dataSize = f->fUCLimit - f->fUCPos;
- if(dataSize != 0) {
- memmove(f->fUCBuffer,
- f->fUCPos,
- dataSize * sizeof(UChar));
- }
-
- /* record how much buffer space is available */
- availLength = UFILE_UCHARBUFFER_SIZE - dataSize;
-
- /* Determine the # of codepage bytes needed to fill our UChar buffer */
- maxCPBytes = availLength * ucnv_getMaxCharSize(f->fConverter);
-
- /* Read in the data to convert */
- bytesRead = fread(f->fCharBuffer,
- sizeof(char),
- ufmt_min(maxCPBytes, UFILE_CHARBUFFER_SIZE),
- f->fFile);
-
- /* Set up conversion parameters */
- status = U_ZERO_ERROR;
- mySource = f->fCharBuffer;
- mySourceEnd = f->fCharBuffer + bytesRead;
- myTarget = f->fUCBuffer + dataSize;
- bufferSize = UFILE_UCHARBUFFER_SIZE;
-
- /* Perform the conversion */
- ucnv_toUnicode(f->fConverter,
- &myTarget,
- f->fUCBuffer + bufferSize,
- &mySource,
- mySourceEnd,
- NULL,
- TRUE,
- &status);
-
- /* update the pointers into our array */
- f->fUCPos = f->fUCBuffer;
- f->fUCLimit = myTarget;
- }
-
- UChar*
- u_fgets(UFILE *f,
- int32_t n,
- UChar *s)
- {
- int32_t dataSize;
- int32_t read;
- int32_t count;
- UChar *alias;
-
-
- /* fill the buffer */
- ufile_fill_uchar_buffer(f);
-
- /* subtract 1 from n to compensate for the terminator */
- --n;
-
- /* determine the amount of data in the buffer */
- dataSize = f->fUCLimit - f->fUCPos;
-
- /* if the buffer contains more data than requested, operate on the buffer */
- if(dataSize > n) {
-
- /* find the first occurrence of a delimiter character */
- alias = f->fUCPos;
- count = 0;
- while( ! IS_STRING_DELIMITER(*alias) && count < n) {
- ++count;
- *alias++;
- }
-
- /* copy the characters into the target*/
- memcpy(s, f->fUCPos, count * sizeof(UChar));
-
- /* add the terminator */
- s[count] = 0x0000;
-
- /* update the current buffer position */
- f->fUCPos += count;
-
- /* refill the buffer */
- ufile_fill_uchar_buffer(f);
-
- /* skip over any remaining delimiters */
- while(IS_STRING_DELIMITER(*(f->fUCPos)) && f->fUCPos < f->fUCLimit)
- *(f->fUCPos)++;
-
- /* return s */
- return s;
- }
-
- /* otherwise, iteratively fill the buffer and copy */
- read = 0;
- do {
-
- /* determine the amount of data in the buffer */
- dataSize = f->fUCLimit - f->fUCPos;
-
- /* find the first occurrence of a delimiter character, if present */
- alias = f->fUCPos;
- count = 0;
- while( ! IS_STRING_DELIMITER(*alias) && alias < f->fUCLimit && count < n) {
- ++count;
- *alias++;
- }
-
- /* copy the current data in the buffer */
- memcpy(s + read, f->fUCPos, count * sizeof(UChar));
-
- /* update number of items read */
- read += count;
-
- /* update the current buffer position */
- f->fUCPos += count;
-
- /* if we found a delimiter */
- if(alias < f->fUCLimit) {
-
- /* refill the buffer */
- ufile_fill_uchar_buffer(f);
-
- /* skip over any remaining delimiters */
- while(IS_STRING_DELIMITER(*(f->fUCPos)) && f->fUCPos < f->fUCLimit)
- *(f->fUCPos)++;
-
- /* break out */
- break;
- }
-
- /* refill the buffer */
- ufile_fill_uchar_buffer(f);
-
- } while(dataSize != 0 && read < n);
-
- /* if 0 characters were read, return 0 */
- if(read == 0)
- return 0;
-
- /* add the terminator and return s */
- s[read] = 0x0000;
- return s;
- }
-
- UChar
- u_fgetc(UFILE *f)
- {
- /* if we have an available character in the buffer, return it */
- if(f->fUCPos < f->fUCLimit)
- return *(f->fUCPos)++;
- /* otherwise, fill the buffer and return the next character */
- else {
- ufile_fill_uchar_buffer(f);
- if(f->fUCPos < f->fUCLimit)
- return *(f->fUCPos)++;
- else
- return 0xFFFF;
- }
- }
-
- UChar
- u_fungetc(UChar c,
- UFILE *f)
- {
- /* if we're at the beginning of the buffer, sorry! */
- if(f->fUCPos == f->fUCBuffer)
- return 0xFFFF;
- /* otherwise, put the character back */
- else {
- *--(f->fUCPos) = c;
- return c;
- }
- }
-
- int32_t
- u_file_read( UChar *chars,
- int32_t count,
- UFILE *f)
- {
- int32_t dataSize;
- int32_t read;
-
- /* fill the buffer */
- ufile_fill_uchar_buffer(f);
-
- /* determine the amount of data in the buffer */
- dataSize = f->fUCLimit - f->fUCPos;
-
- /* if the buffer contains the amount requested, just copy */
- if(dataSize > count) {
- memcpy(chars, f->fUCPos, count * sizeof(UChar));
-
- /* update the current buffer position */
- f->fUCPos += count;
-
- /* return # of chars read */
- return count;
- }
-
- /* otherwise, iteratively fill the buffer and copy */
- read = 0;
- do {
-
- /* determine the amount of data in the buffer */
- dataSize = f->fUCLimit - f->fUCPos;
-
- /* copy the current data in the buffer */
- memcpy(chars + read, f->fUCPos, dataSize * sizeof(UChar));
-
- /* update number of items read */
- read += dataSize;
-
- /* update the current buffer position */
- f->fUCPos += dataSize;
-
- /* refill the buffer */
- ufile_fill_uchar_buffer(f);
-
- } while(dataSize != 0 && read < count);
-
- return read;
- }
-