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dnp_ds40: Handle reading in the plane data as smaller chunks. 

Fixes use when data is piped in.
master
Solomon Peachy 2013-12-19 07:56:16 -05:00
parent 13e25a4c95
commit b872a63533
1 changed files with 15 additions and 8 deletions
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23
backend_dnpds40.c
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@ -345,6 +345,7 @@ static int dnpds40_read_parse(void *vctx, int data_fd) {
/* Read in command header */
while (1) {
int remain;
i = read(data_fd, ctx->databuf + ctx->datalen,
sizeof(struct dnpds40_cmd));
if (i < 0)
@ -364,13 +365,19 @@ static int dnpds40_read_parse(void *vctx, int data_fd) {
memcpy(buf, ctx->databuf + ctx->datalen + 24, 8);
j = atoi(buf);
/* Read in data chunk */
i = read(data_fd, ctx->databuf + ctx->datalen + sizeof(struct dnpds40_cmd),
j);
if (i < 0)
return i;
if (i != j)
return 1;
/* Read in data chunk as quickly as possible */
remain = j;
while (remain > 0) {
i = read(data_fd, ctx->databuf + ctx->datalen + sizeof(struct dnpds40_cmd),
remain);
if (i < 0)
return i;
if (i == 0)
return 1;
ctx->datalen += i;
remain -= i;
}
ctx->datalen -= j; /* Back it off */
/* Check for some offsets */
if(!memcmp("CNTRL QTY", ctx->databuf + ctx->datalen+2, 9)) {
@ -902,7 +909,7 @@ static int dnpds40_cmdline_arg(void *vctx, int run, char *arg1, char *arg2)
/* Exported */
struct dyesub_backend dnpds40_backend = {
.name = "DNP DS40/DS80",
.version = "0.19",
.version = "0.20",
.uri_prefix = "dnpds40",
.cmdline_usage = dnpds40_cmdline,
.cmdline_arg = dnpds40_cmdline_arg,