media: atomisp: get rid of a string_support.h abstraction layer

Some parts of the driver have their own implementation of
memcpy() & friends. Replace all of them by strscpy().
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/hive_isp_css_include/string_support.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Support for Intel Camera Imaging ISP subsystem.
- * Copyright (c) 2015, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- */
-
-#ifndef __STRING_SUPPORT_H_INCLUDED__
-#define __STRING_SUPPORT_H_INCLUDED__
-#include <platform_support.h>
-#include <type_support.h>
-
-/*
- * For all non microsoft cases, we need the following functions
- */
-
-/* @brief Copy from src_buf to dest_buf.
- *
- * @param[out] dest_buf. Destination buffer to copy to
- * @param[in]  dest_size. The size of the destination buffer in bytes
- * @param[in]  src_buf. The source buffer
- * @param[in]  src_size. The size of the source buffer in bytes
- * @return     0 on success, error code on failure
- * @return     -EINVAL on Invalid arguments
- * @return     ERANGE on Destination size too small
- */
-static inline int memcpy_s(
-    void *dest_buf,
-    size_t dest_size,
-    const void *src_buf,
-    size_t src_size)
-{
-	if ((!src_buf) || (!dest_buf)) {
-		/* Invalid arguments*/
-		return -EINVAL;
-	}
-
-	if ((dest_size < src_size) || (src_size == 0)) {
-		/* Destination too small*/
-		return ERANGE;
-	}
-
-	memcpy(dest_buf, src_buf, src_size);
-	return 0;
-}
-
-/* @brief Get the length of the string, excluding the null terminator
- *
- * @param[in]  src_str. The source string
- * @param[in]  max_len. Look only for max_len bytes in the string
- * @return     Return the string length excluding null character
- * @return     Return max_len if no null character in the first max_len bytes
- * @return     Returns 0 if src_str is NULL
- */
-static size_t strnlen_s(
-    const char *src_str,
-    size_t max_len)
-{
-	size_t ix;
-
-	if (!src_str) {
-		/* Invalid arguments*/
-		return 0;
-	}
-
-	for (ix = 0; ix < max_len && src_str[ix] != '\0'; ix++)
-		;
-
-	/* On Error, it will return src_size == max_len*/
-	return ix;
-}
-
-/* @brief Copy string from src_str to dest_str
- *
- * @param[out] dest_str. Destination buffer to copy to
- * @param[in]  dest_size. The size of the destination buffer in bytes
- * @param[in]  src_str. The source buffer
- * @param[in]  src_size. The size of the source buffer in bytes
- * @return     Returns 0 on success
- * @return     Returns -EINVAL on invalid arguments
- * @return     Returns ERANGE on destination size too small
- */
-static inline int strncpy_s(
-    char *dest_str,
-    size_t dest_size,
-    const char *src_str,
-    size_t src_size)
-{
-	size_t len;
-
-	if (!dest_str) {
-		/* Invalid arguments*/
-		return -EINVAL;
-	}
-
-	if ((!src_str) || (dest_size == 0)) {
-		/* Invalid arguments*/
-		dest_str[0] = '\0';
-		return -EINVAL;
-	}
-
-	len = strnlen_s(src_str, src_size);
-
-	if (len >= dest_size) {
-		/* Destination too small*/
-		dest_str[0] = '\0';
-		return ERANGE;
-	}
-
-	/* dest_str is big enough for the len */
-	strncpy(dest_str, src_str, len);
-	dest_str[len] = '\0';
-	return 0;
-}
-
-/* @brief Copy string from src_str to dest_str
- *
- * @param[out] dest_str. Destination buffer to copy to
- * @param[in]  dest_size. The size of the destination buffer in bytes
- * @param[in]  src_str. The source buffer
- * @return     Returns 0 on success
- * @return     Returns -EINVAL on invalid arguments
- * @return     Returns ERANGE on destination size too small
- */
-static inline int strcpy_s(
-    char *dest_str,
-    size_t dest_size,
-    const char *src_str)
-{
-	size_t len;
-
-	if (!dest_str) {
-		/* Invalid arguments*/
-		return -EINVAL;
-	}
-
-	if ((!src_str) || (dest_size == 0)) {
-		/* Invalid arguments*/
-		dest_str[0] = '\0';
-		return -EINVAL;
-	}
-
-	len = strnlen_s(src_str, dest_size);
-
-	if (len >= dest_size) {
-		/* Destination too small*/
-		dest_str[0] = '\0';
-		return ERANGE;
-	}
-
-	/* dest_str is big enough for the len */
-	strncpy(dest_str, src_str, len);
-	dest_str[len] = '\0';
-	return 0;
-}
-
-#endif /* __STRING_SUPPORT_H_INCLUDED__ */

drivers/staging/media/atomisp/pci/isp/kernels/ctc/ctc_1.0/ia_css_ctc_table.host.c

@@ -13,8 +13,9 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
+
 #include <type_support.h>
-#include <string_support.h> /* memcpy */
 #include "system_global.h"
 #include "vamem.h"
 #include "ia_css_types.h"

drivers/staging/media/atomisp/pci/isp/kernels/gc/gc_1.0/ia_css_gc_table.host.c

@@ -13,8 +13,9 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
+
 #include <type_support.h>
-#include <string_support.h> /* memcpy */
 #include "system_global.h"
 #include "vamem.h"
 #include "ia_css_types.h"

drivers/staging/media/atomisp/pci/isp/kernels/gc/gc_2/ia_css_gc2_table.host.c

@@ -13,8 +13,9 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
+
 #include <type_support.h>
-#include <string_support.h> /* memcpy */
 #include "system_global.h"
 #include "vamem.h"
 #include "ia_css_types.h"

drivers/staging/media/atomisp/pci/isp/kernels/xnr/xnr_1.0/ia_css_xnr_table.host.c

@@ -13,8 +13,9 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
+
 #include <type_support.h>
-#include <string_support.h> /* memcpy */
 #include "system_global.h"
 #include "vamem.h"
 #include "ia_css_types.h"

drivers/staging/media/atomisp/pci/runtime/debug/src/ia_css_debug.c

@@ -31,6 +31,8 @@
 #define __INLINE_STREAM2MMIO__
 #endif
 
+#include <linux/string.h> /* for strscpy() */
+
 #include "ia_css_debug.h"
 #include "ia_css_debug_pipe.h"
 #include "ia_css_irq.h"
@@ -47,7 +49,6 @@
 #include "system_local.h"
 #include "assert_support.h"
 #include "print_support.h"
-#include "string_support.h"
 
 #include "fifo_monitor.h"
 
@@ -2769,8 +2770,9 @@ ia_css_debug_pipe_graph_dump_stage(
 				 stage->binary->info->blob->name, stage->stage_num);
 	} else if (stage->firmware) {
 		bin_type = "firmware";
-		strncpy_s(blob_name, sizeof(blob_name),
-			  IA_CSS_EXT_ISP_PROG_NAME(stage->firmware), sizeof(blob_name));
+
+		strscpy(blob_name, IA_CSS_EXT_ISP_PROG_NAME(stage->firmware),
+			sizeof(blob_name));
 	}
 
 	/* Guard in case of binaries that don't have any binary_info */
@@ -2836,10 +2838,8 @@ ia_css_debug_pipe_graph_dump_stage(
 				while (ei[p] != ',')
 					p--;
 				/* Last comma found, copy till that comma */
-				strncpy_s(enable_info1,
-					  sizeof(enable_info1),
-					  ei, p);
-				enable_info1[p] = '\0';
+				strscpy(enable_info1, ei,
+                                        p > sizeof(enable_info1) ? sizeof(enable_info1) : p);
 
 				ei += p + 1;
 				l = strlen(ei);
@@ -2849,10 +2849,10 @@ ia_css_debug_pipe_graph_dump_stage(
 					/* we cannot use ei as argument because
 					 * it is not guaranteed dword aligned
 					 */
-					strncpy_s(enable_info2,
-						  sizeof(enable_info2),
-						  ei, l);
-					enable_info2[l] = '\0';
+
+					strscpy(enable_info2, ei,
+						l > sizeof(enable_info2) ? sizeof(enable_info2) : l);
+
 					snprintf(enable_info, sizeof(enable_info), "%s\\n%s",
 						 enable_info1, enable_info2);
 
@@ -2861,10 +2861,10 @@ ia_css_debug_pipe_graph_dump_stage(
 					p = ENABLE_LINE_MAX_LENGTH;
 					while (ei[p] != ',')
 						p--;
-					strncpy_s(enable_info2,
-						  sizeof(enable_info2),
-						  ei, p);
-					enable_info2[p] = '\0';
+
+					strscpy(enable_info2, ei,
+						p > sizeof(enable_info2) ? sizeof(enable_info2) : p);
+
 					ei += p + 1;
 					l = strlen(ei);
 
@@ -2873,9 +2873,8 @@ ia_css_debug_pipe_graph_dump_stage(
 						/* we cannot use ei as argument because
 						* it is not guaranteed dword aligned
 						*/
-						strcpy_s(enable_info3,
-							 sizeof(enable_info3), ei);
-						enable_info3[l] = '\0';
+						strscpy(enable_info3, ei,
+							sizeof(enable_info3));
 						snprintf(enable_info, sizeof(enable_info),
 							 "%s\\n%s\\n%s",
 							 enable_info1, enable_info2,
@@ -2885,13 +2884,11 @@ ia_css_debug_pipe_graph_dump_stage(
 						p = ENABLE_LINE_MAX_LENGTH;
 						while (ei[p] != ',')
 							p--;
-						strncpy_s(enable_info3,
-							  sizeof(enable_info3),
-							  ei, p);
-						enable_info3[p] = '\0';
+						strscpy(enable_info3, ei,
+							p > sizeof(enable_info3) ? sizeof(enable_info3) : p);
 						ei += p + 1;
-						strcpy_s(enable_info3,
-							 sizeof(enable_info3), ei);
+						strscpy(enable_info3, ei,
+							sizeof(enable_info3));
 						snprintf(enable_info, sizeof(enable_info),
 							 "%s\\n%s\\n%s",
 							 enable_info1, enable_info2,

drivers/staging/media/atomisp/pci/runtime/isys/src/virtual_isys.c

@@ -13,6 +13,8 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
+
 #include "system_global.h"
 
 #ifdef USE_INPUT_SYSTEM_VERSION_2401
@@ -20,7 +22,6 @@
 #include "ia_css_isys.h"
 #include "ia_css_debug.h"
 #include "math_support.h"
-#include "string_support.h"
 #include "virtual_isys.h"
 #include "isp.h"
 #include "sh_css_defs.h"
@@ -650,14 +651,8 @@ static bool calculate_tpg_cfg(
     input_system_cfg_t		*isys_cfg,
     pixelgen_tpg_cfg_t		*cfg)
 {
-	(void)channel;
-	(void)input_port;
+	memcpy(cfg, &isys_cfg->tpg_port_attr, sizeof(pixelgen_tpg_cfg_t));
 
-	memcpy_s(
-	    (void *)cfg,
-	    sizeof(pixelgen_tpg_cfg_t),
-	    (void *)(&isys_cfg->tpg_port_attr),
-	    sizeof(pixelgen_tpg_cfg_t));
 	return true;
 }
 
@@ -667,14 +662,8 @@ static bool calculate_prbs_cfg(
     input_system_cfg_t		*isys_cfg,
     pixelgen_prbs_cfg_t		*cfg)
 {
-	(void)channel;
-	(void)input_port;
+	memcpy(cfg, &isys_cfg->prbs_port_attr, sizeof(pixelgen_prbs_cfg_t));
 
-	memcpy_s(
-	    (void *)cfg,
-	    sizeof(pixelgen_prbs_cfg_t),
-	    (void *)(&isys_cfg->prbs_port_attr),
-	    sizeof(pixelgen_prbs_cfg_t));
 	return true;
 }
 
@@ -692,12 +681,10 @@ static bool calculate_be_cfg(
     bool				metadata,
     csi_rx_backend_cfg_t		*cfg)
 {
-	memcpy_s(
-	    (void *)(&cfg->lut_entry),
-	    sizeof(csi_rx_backend_lut_entry_t),
-	    metadata ? (void *)(&input_port->metadata.backend_lut_entry) :
-	    (void *)(&input_port->csi_rx.backend_lut_entry),
-	    sizeof(csi_rx_backend_lut_entry_t));
+	memcpy(&cfg->lut_entry,
+	      metadata ? &input_port->metadata.backend_lut_entry :
+			 &input_port->csi_rx.backend_lut_entry,
+	      sizeof(csi_rx_backend_lut_entry_t));
 
 	cfg->csi_mipi_cfg.virtual_channel = isys_cfg->csi_port_attr.ch_id;
 	if (metadata) {

drivers/staging/media/atomisp/pci/sh_css_firmware.c

@@ -13,6 +13,7 @@
  * more details.
  */
 
+#include <linux/string.h> /* for memcpy() */
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 
@@ -28,7 +29,6 @@
 #include "ia_css_isp_param.h"
 
 #include "assert_support.h"
-#include "string_support.h"
 
 #include "isp.h"				/* PMEM_WIDTH_LOG2 */