diff options
Diffstat (limited to 'ft2232_spi.c')
| -rw-r--r-- | ft2232_spi.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/ft2232_spi.c b/ft2232_spi.c index aa00753..d565a6f 100644 --- a/ft2232_spi.c +++ b/ft2232_spi.c @@ -200,14 +200,22 @@ int ft2232_spi_send_command(unsigned int writecnt, unsigned int readcnt, static unsigned char *buf = NULL; /* failed is special. We use bitwise ops, but it is essentially bool. */ int i = 0, ret = 0, failed = 0; + int bufsize; + static int oldbufsize = 0; if (writecnt > 65536 || readcnt > 65536) return SPI_INVALID_LENGTH; - buf = realloc(buf, writecnt + readcnt + 100); - if (!buf) { - fprintf(stderr, "Out of memory!\n"); - exit(1); // -1 + /* buf is not used for the response from the chip. */ + bufsize = max(writecnt + 9, 260 + 9); + /* Never shrink. realloc() calls are expensive. */ + if (bufsize > oldbufsize) { + buf = realloc(buf, bufsize); + if (!buf) { + fprintf(stderr, "Out of memory!\n"); + exit(1); + } + oldbufsize = bufsize; } /* |
