From d0956ca8b5e829e0fb7d379b18a2ba400a3bb913 Mon Sep 17 00:00:00 2001
From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Fri, 28 Mar 2008 15:56:35 +0000
Subject: [PATCH] Added comedi_get_hardware_buffer_size() wrapper function, and
 made comedi_strerror return a const char*.

---
 include/comedilib.h        |  3 ++-
 lib/error.c                |  2 +-
 lib/insn_config_wrappers.c | 19 +++++++++++++++++++
 lib/version_script         |  1 +
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/include/comedilib.h b/include/comedilib.h
index db2eb95..3e24428 100644
--- a/include/comedilib.h
+++ b/include/comedilib.h
@@ -71,7 +71,7 @@ int comedi_close(comedi_t *it);
 /* logging */
 int comedi_loglevel(int loglevel);
 void comedi_perror(const char *s);
-char *comedi_strerror(int errnum);
+const char *comedi_strerror(int errnum);
 int comedi_errno(void);
 int comedi_fileno(comedi_t *it);
 
@@ -286,6 +286,7 @@ int comedi_set_gate_source(comedi_t *device, unsigned subdevice, unsigned channe
 int comedi_set_other_source(comedi_t *device, unsigned subdevice, unsigned channel,
 	unsigned other, unsigned source);
 int comedi_set_routing(comedi_t *device, unsigned subdevice, unsigned channel, unsigned routing);
+int comedi_get_hardware_buffer_size(comedi_t *device, unsigned subdevice, enum comedi_io_direction direction);
 
 #endif
 
diff --git a/lib/error.c b/lib/error.c
index 2f55e1f..d88c78c 100644
--- a/lib/error.c
+++ b/lib/error.c
@@ -59,7 +59,7 @@ int _comedi_errno(void)
 }
 
 EXPORT_ALIAS_DEFAULT(_comedi_strerror,comedi_strerror,0.7.18);
-char* _comedi_strerror(int errnum)
+const char* _comedi_strerror(int errnum)
 {
 	if(errnum<COMEDI_NOERROR || errnum>=COMEDI_NOERROR+n_errors)
 		return strerror(errnum);
diff --git a/lib/insn_config_wrappers.c b/lib/insn_config_wrappers.c
index 3d86afd..8361425 100644
--- a/lib/insn_config_wrappers.c
+++ b/lib/insn_config_wrappers.c
@@ -276,3 +276,22 @@ int _comedi_set_routing(comedi_t *device, unsigned subdevice, unsigned channel,
 	if(comedi_do_insn(device, &insn) >= 0) return 0;
 	else return -1;
 }
+
+EXPORT_ALIAS_DEFAULT(_comedi_get_hardware_buffer_size,comedi_get_hardware_buffer_size,0.9.0);
+int _comedi_get_hardware_buffer_size(comedi_t *device, unsigned subdevice, enum comedi_io_direction direction)
+{
+	comedi_insn insn;
+	lsampl_t data[3];
+
+	memset(&insn, 0, sizeof(comedi_insn));
+	insn.insn = INSN_CONFIG;
+	insn.subdev = subdevice;
+	insn.data = data;
+	insn.n = sizeof(data) / sizeof(data[0]);
+	memset(insn.data, 0, insn.n * sizeof(insn.data[0]));
+	data[0] = INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE;
+	data[1] = direction;
+
+	if(comedi_do_insn(device, &insn) >= 0) return data[2];
+	else return -1;
+}
diff --git a/lib/version_script b/lib/version_script
index 2b608ab..6721f23 100644
--- a/lib/version_script
+++ b/lib/version_script
@@ -108,4 +108,5 @@ v0.9.0 {
 		comedi_internal_trigger;
 		comedi_set_other_source;
 		comedi_set_routing;
+		comedi_get_hardware_buffer_size;
 } v0.8.0;
-- 
2.26.2