From 7d0516046bddaee8a86306aaa86898e40c4d46a7 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux@dominikbrodowski.net>
Date: Sat, 14 Apr 2018 14:08:08 +0100
Subject: pcmciautils: remove dependency on libsysfs

Origin: upstream, http://git.kernel.org/?p=linux/pcmcia/pcmciautils.git;a=commit;h=f31a75997f33c8c1ac291d657eb26ea0a1189459
Bug-Debian: http://bugs.debian.org/627648

Patch-Name: remove-libsysfs-dep.patch
---
 Makefile           |   4 +-
 doc/mini-howto.txt |   3 +-
 src/pccardctl.c    | 199 ++++++++++++++++++++-------------------------
 src/read-cis.c     |   3 +-
 src/startup.c      | 101 ++++++++++++-----------
 5 files changed, 144 insertions(+), 166 deletions(-)

diff --git a/Makefile b/Makefile
index 5713c51..d3a9505 100644
--- a/Makefile
+++ b/Makefile
@@ -156,12 +156,12 @@ CFLAGS +=	-I$(PWD)/src
 
 CFLAGS += $(WARNINGS) -I$(GCCINCDIR)
 
-LIB_OBJS = -lc -lsysfs
+LIB_OBJS = -lc
 LIB_PLAIN_OBJS = -lc
 LIB_PCI_OBJS = -lc -lpci
 
 ifeq ($(strip $(STATIC)),true)
-	LIB_OBJS = -lsysfs
+	LIB_OBJS = 
 	LIB_PLAIN_OBJS =
 	LIB_PCI_OBJS = -lpci
 	LDFLAGS += -static
diff --git a/doc/mini-howto.txt b/doc/mini-howto.txt
index 78d8d2b..3e4ecd3 100644
--- a/doc/mini-howto.txt
+++ b/doc/mini-howto.txt
@@ -112,8 +112,7 @@ Table of contents:
   2.3. Dependencies
   -----------------
 
-   To use any of the PCMCIAutils tools, you need sysfsutils 1.3.0 or
-   newer. However, if you do not need a resource database, you do not run
+   If you do not need a resource database, you do not run
    a modular kernel and you are lucky, you might not need any userspace
    tools at all.
 
diff --git a/src/pccardctl.c b/src/pccardctl.c
index 05cb3a0..2147989 100644
--- a/src/pccardctl.c
+++ b/src/pccardctl.c
@@ -19,12 +19,13 @@
 #include <libgen.h>
 #include <locale.h>
 #include <ctype.h>
-
-#include <sysfs/libsysfs.h>
-
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <getopt.h>
 
 #define MAX_SOCKET 8
+#define SYSFS_PATH_MAX 255
 
 static const char * const fn[] = {
 	"multifunction",
@@ -51,87 +52,89 @@ static unsigned int crc32(unsigned char const *p, unsigned int len)
 	return crc;
 }
 
+static int sysfs_write_file(const char *fname, const char *value, size_t len)
+{
+	ssize_t numwrite;
+	int fd;
+	int ret = 0;
+
+	fd = open(fname, O_WRONLY);
+	if (fd <= 0)
+		return fd;
+
+	numwrite = write(fd, value, len);
+	if ((numwrite < 1) || ((size_t) numwrite != len))
+		ret = -EIO;
+
+	close(fd);
+	return ret;
+}
 
 static int pccardctl_power_socket(unsigned long socket_no, unsigned int power)
 {
-	int ret;
 	char file[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 
 	snprintf(file, SYSFS_PATH_MAX,
 		 "/sys/class/pcmcia_socket/pcmcia_socket%lu/card_pm_state",
 		 socket_no);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return -ENODEV;
-
-	ret = sysfs_write_attribute(attr, power ? "off" : "on", power ? 3 : 2);
-
-	sysfs_close_attribute(attr);
-
-	return ret;
+	return sysfs_write_file(file, power ? "off" : "on", power ? 3 : 2);
 }
 
 static int pccardctl_echo_one(unsigned long socket_no, const char *in_file)
 {
-	int ret;
 	char file[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 
 	snprintf(file, SYSFS_PATH_MAX,
 		"/sys/class/pcmcia_socket/pcmcia_socket%lu/%s",
 		socket_no, in_file);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return -ENODEV;
-
-	ret = sysfs_write_attribute(attr, "42", 2);
-
-	sysfs_close_attribute(attr);
-
-	return ret;
+	return sysfs_write_file(file, "42", 2);
 }
 
 static int pccardctl_socket_exists(unsigned long socket_no)
 {
 	char file[SYSFS_PATH_MAX];
+	struct stat st;
 
 	snprintf(file, SYSFS_PATH_MAX,
 		 "/sys/class/pcmcia_socket/pcmcia_socket%lu/card_insert",
 		 socket_no);
 
-	return !(sysfs_path_is_file(file));
+	return !stat(file, &st);
 }
 
-static int read_out_file(char *file, char **output)
+static int sysfs_read_whole_file(char *file, char **output)
 {
-	struct sysfs_attribute *attr = sysfs_open_attribute(file);
-	int ret;
 	char *result = NULL;
+	ssize_t numread;
+	off_t size;
+	int fd, ret = 0;
 
 	*output = NULL;
 
-	if (!attr)
-		return -EIO;
-	ret = sysfs_read_attribute(attr);
+	fd = open(file, O_RDONLY);
+	if (fd <= 0)
+		return fd;
 
-	if (ret || !attr->value || !attr->len || (attr->len > SYSFS_PATH_MAX))
-		goto close_out;
+	/* determine size */
+	size = lseek(fd, 0, SEEK_END) + SYSFS_PATH_MAX;
+	result = malloc(size);
+	if (!result) {
+		close(fd);
+		return -ENOMEM;
+	}
 
-	result = malloc(attr->len + 1);
-	if (result) {
-		memcpy(result, attr->value, attr->len);
-		result[attr->len] = '\0';
-		if (result[attr->len - 1] == '\n')
-			result[attr->len - 1] = '\0';
+	lseek(fd, 0, SEEK_SET);
+	numread = read(fd, result, size - 1);
+	if (numread < 1)
+		ret = -EIO;
+	else {
+		result[numread] = '\0';
 		*output = result;
-	} else
-		ret = -ENOMEM;
+	}
 
- close_out:
-	sysfs_close_attribute(attr);
+	close(fd);
 	return ret;
 }
 
@@ -144,7 +147,7 @@ static int pccardctl_get_string_socket(unsigned long socket_no,
 		"/sys/class/pcmcia_socket/pcmcia_socket%lu/%s",
 		 socket_no, in_file);
 
-	return read_out_file(file, output);
+	return sysfs_read_whole_file(file, output);
 }
 
 static int pccardctl_get_string(unsigned long socket_no,
@@ -155,7 +158,7 @@ static int pccardctl_get_string(unsigned long socket_no,
 	snprintf(file, SYSFS_PATH_MAX, "/sys/bus/pcmcia/devices/%lu.0/%s",
 		 socket_no, in_file);
 
-	return read_out_file(file, output);
+	return sysfs_read_whole_file(file, output);
 }
 
 static int pccardctl_get_one_f(unsigned long socket_no, unsigned int dev,
@@ -163,17 +166,19 @@ static int pccardctl_get_one_f(unsigned long socket_no, unsigned int dev,
 {
 	char *value;
 	char file[SYSFS_PATH_MAX];
-	int ret;
+	int ret = 0;
 
 	snprintf(file, SYSFS_PATH_MAX, "/sys/bus/pcmcia/devices/%lu.%u/%s",
 		 socket_no, dev, in_file);
-	ret = read_out_file(file, &value);
+	ret = sysfs_read_whole_file(file, &value);
 	if (ret || !value)
 		return -EINVAL;
 
 	if (sscanf(value, "0x%X", result) != 1)
-		return -EIO;
-	return 0;
+		ret = -EIO;
+
+	free(value);
+	return ret;
 }
 
 static int pccardctl_get_one(unsigned long socket_no, const char *in_file,
@@ -187,36 +192,40 @@ static int pccardctl_get_power_device(unsigned long socket_no,
 {
 	char *value;
 	char file[SYSFS_PATH_MAX];
+	int ret = -ENODEV;
 
 	snprintf(file, SYSFS_PATH_MAX,
 		"/sys/bus/pcmcia/devices/%lu.%u/pm_state",
 		 socket_no, func);
-	read_out_file(file, &value);
+	sysfs_read_whole_file(file, &value);
 	if (value) {
 		if (!strncmp(value, "off", 3))
-			return 1;
-		return 0;
+			ret = 1;
+		ret = 0;
+		free(value);
 	}
 
-	return -ENODEV;
+	return ret;
 }
 
 static int pccardctl_get_power_socket(unsigned long socket_no)
 {
 	char *value;
 	char file[SYSFS_PATH_MAX];
+	int ret = -ENODEV;
 
 	snprintf(file, SYSFS_PATH_MAX,
 		"/sys/class/pcmcia_socket/pcmcia_socket%lu/card_pm_state",
 		 socket_no);
-	read_out_file(file, &value);
+	sysfs_read_whole_file(file, &value);
 	if (value) {
 		if (!strncmp(value, "off", 3))
-			return 1;
-		return 0;
+			ret = 1;
+		ret = 0;
+		free(value);
 	}
 
-	return -ENODEV;
+	return ret;
 }
 
 
@@ -262,7 +271,6 @@ static int pccardctl_ident(unsigned long socket_no)
 		printf("  function: %d (%s)\n", manf_id, s);
 	}
 
-
 	return 0;
 }
 
@@ -323,6 +331,8 @@ static int pccardctl_status(unsigned long socket_no)
 
 	printf("  %s %s %s", card_voltage, card_type, is_cardbus ?
 		"CardBus card" : "PC Card");
+	free(card_type);
+	free(card_voltage);
 
 	susp = pccardctl_get_power_socket(socket_no);
 	if (susp > 0)
@@ -365,7 +375,7 @@ static int pccardctl_status(unsigned long socket_no)
 static void print_header(void)
 {
 	printf("pcmciautils %s\n", PCMCIAUTILS_VERSION);
-	printf("Copyright (C) 2004-2005 Dominik Brodowski, "
+	printf("Copyright (C) 2004-2011 Dominik Brodowski, "
 		"(C) 1999 David A. Hinds\n");
 	printf("Report errors and bugs to <linux-pcmcia@lists.infradead.org>,"
 		"please.\n");
@@ -412,7 +422,6 @@ static void lspcmcia_socket_available_resources(unsigned long socket_no,
 						char *which)
 {
 	char file[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 	int ret, length, first = 0;
 	char *sep;
 	char *result = NULL;
@@ -421,27 +430,10 @@ static void lspcmcia_socket_available_resources(unsigned long socket_no,
 	"/sys/class/pcmcia_socket/pcmcia_socket%lu/available_resources_%s",
 		socket_no, which);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return;
-
-
-	ret = sysfs_read_attribute(attr);
-	if (ret)
-		goto close_out;
-
 	printf("\t\t\tAvailable %s:\t", which[0] == 'i' ? "ioports" : "iomem");
 
-	if (!attr->value || !attr->len || (attr->len < 5))
-		goto close_out;
-
-	result = malloc(attr->len + 1);
-	if (result) {
-		memcpy(result, attr->value, attr->len);
-		result[attr->len] = '\0';
-		if (result[attr->len - 1] == '\n')
-			result[attr->len - 1] = '\0';
-	} else
+	ret = sysfs_read_whole_file(file, &result);
+	if (ret)
 		goto close_out;
 
 	ret = 0;
@@ -458,15 +450,13 @@ static void lspcmcia_socket_available_resources(unsigned long socket_no,
 			ret += length + 1;
 		}
 	} while (sep);
-	if (result) {
-		printf("%s\n", &result[ret]);
-		first++;
-	}
+	printf("%s\n", &result[ret]);
+	first++;
+	free(result);
 
  close_out:
 	if (!first)
 		printf("--none--\n");
-	sysfs_close_attribute(attr);
 	return;
 }
 
@@ -479,7 +469,6 @@ static void lspcmcia_socket(unsigned long socket_no, int verbose, char *driver)
 	pccardctl_get_string_socket(socket_no,
 				"available_resources_setup_done", &ready);
 
-
 	printf("\tConfiguration:\tstate: %s\tready: %s\n",
 		pm_state ? "suspended" : "on", ready ? ready : "unknown");
 
@@ -489,6 +478,10 @@ static void lspcmcia_socket(unsigned long socket_no, int verbose, char *driver)
 	if (card_voltage && card_vpp && card_vcc)
 		printf("\t\t\tVoltage: %s Vcc: %s Vpp: %s\n",
 			card_voltage, card_vcc, card_vpp);
+	free(card_voltage);
+	free(card_vpp);
+	free(card_vcc);
+	free(ready);
 
 	if (verbose > 1) {
 		char *irq_mask_s;
@@ -511,7 +504,7 @@ static void lspcmcia_socket(unsigned long socket_no, int verbose, char *driver)
 				printf("none");
 			printf("\n");
 		}
-
+		free(irq_mask_s);
 		lspcmcia_socket_available_resources(socket_no, "io");
 		lspcmcia_socket_available_resources(socket_no, "mem");
 	}
@@ -521,7 +514,6 @@ static void lspcmcia_socket(unsigned long socket_no, int verbose, char *driver)
 static void lspcmcia_device_resources(unsigned long socket_no, int fun)
 {
 	char file[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 	int ret, length;
 	char *sep;
 	char *result = NULL;
@@ -529,25 +521,9 @@ static void lspcmcia_device_resources(unsigned long socket_no, int fun)
 	snprintf(file, SYSFS_PATH_MAX,
 		"/sys/bus/pcmcia/devices/%lu.%u/resources", socket_no, fun);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return;
-
-	ret = sysfs_read_attribute(attr);
+	ret = sysfs_read_whole_file(file, &result);
 	if (ret)
-		goto close_out;
-
-	if (!attr->value || !attr->len || (attr->len < 5))
-		goto close_out;
-
-	result = malloc(attr->len + 1);
-	if (result) {
-		memcpy(result, attr->value, attr->len);
-		result[attr->len] = '\0';
-		if (result[attr->len - 1] == '\n')
-			result[attr->len - 1] = '\0';
-	} else
-		goto close_out;
+		return;
 
 	ret = 0;
 	printf("\t\t\t");
@@ -563,11 +539,9 @@ static void lspcmcia_device_resources(unsigned long socket_no, int fun)
 			ret += length + 1;
 		}
 	} while (sep);
-	if (result)
-		printf("%s\n", &result[ret]);
+	printf("%s\n", &result[ret]);
 
- close_out:
-	sysfs_close_attribute(attr);
+	free(result);
 	return;
 }
 
@@ -620,7 +594,6 @@ static int lspcmcia(unsigned long socket_no, int verbose)
 	if (verbose)
 		lspcmcia_socket(socket_no, verbose, drv);
 
-
 	pccardctl_get_string_socket(socket_no, "card_type", &res);
 	if (!res)
 		return 0;
@@ -628,8 +601,10 @@ static int lspcmcia(unsigned long socket_no, int verbose)
 	if (!strncmp(res, "32", 2)) {
 		printf("  CardBus card -- see \"lspci\" "
 			"for more information\n");
+		free(res);
 		return 0;
 	}
+	free(res);
 
 	for (i = 0; i < 4; i++) {
 		int function;
@@ -666,6 +641,7 @@ static int lspcmcia(unsigned long socket_no, int verbose)
 				pccardctl_get_string(socket_no, file, &res);
 				if (res)
 					printf("%s ", res);
+				free(res);
 			}
 			printf("\n");
 
@@ -694,6 +670,7 @@ static int lspcmcia(unsigned long socket_no, int verbose)
 					printf("prod_id(%u): --- (---)\n", j);
 				if (j < 4)
 					printf("\t\t\t");
+				free(res);
 			}
 		}
 	}
diff --git a/src/read-cis.c b/src/read-cis.c
index 0c2fb48..7204f69 100644
--- a/src/read-cis.c
+++ b/src/read-cis.c
@@ -18,11 +18,10 @@
 #include <errno.h>
 #include <syslog.h>
 
-#include <sysfs/libsysfs.h>
-
 #include "cistpl.h"
 
 #define MAX_TUPLES                0x200
+#define SYSFS_PATH_MAX 255
 
 #define PATH_TO_SOCKET "/sys/class/pcmcia_socket/"
 
diff --git a/src/startup.c b/src/startup.c
index 291198f..30a45a7 100644
--- a/src/startup.c
+++ b/src/startup.c
@@ -15,10 +15,11 @@
 #include <string.h>
 #include <errno.h>
 #include <syslog.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 
-#include <sysfs/libsysfs.h>
-
 #include "startup.h"
 
 /* uncomment for debug output */
@@ -48,6 +49,46 @@ static const char *resource_files[MAX_RESOURCE_FILES] = {
 
 #define PATH_TO_SOCKET "/sys/class/pcmcia_socket/"
 
+#define SYSFS_PATH_MAX 255
+
+
+static int sysfs_read_file(const char *fname, char *buf, size_t buflen)
+{
+	ssize_t numread;
+	int fd;
+	int ret = 0;
+
+	fd = open(fname, O_RDONLY);
+	if (fd <= 0)
+		return fd;
+
+	numread = read(fd, buf, buflen - 1);
+	if (numread < 1)
+		ret = -EIO;
+	else
+		buf[numread] = '\0';
+
+	close(fd);
+	return ret;
+}
+
+static int sysfs_write_file(const char *fname, const char *value, size_t len)
+{
+	ssize_t numwrite;
+	int fd;
+	int ret = 0;
+
+	fd = open(fname, O_WRONLY);
+	if (fd <= 0)
+		return fd;
+
+	numwrite = write(fd, value, len);
+	if ((numwrite < 1) || ((size_t) numwrite != len))
+		ret = -EIO;
+
+	close(fd);
+	return ret;
+}
 
 static int add_available_resource(unsigned int socket_no, unsigned int type,
 				  unsigned int action,
@@ -55,7 +96,6 @@ static int add_available_resource(unsigned int socket_no, unsigned int type,
 {
 	char file[SYSFS_PATH_MAX];
 	char content[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 	int ret;
 	size_t len;
 
@@ -85,44 +125,24 @@ static int add_available_resource(unsigned int socket_no, unsigned int type,
 		return -EINVAL;
 	}
 
-	dprintf("content is %s\n", content);
-
-	dprintf("file is %s\n", file);
-
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return -ENODEV;
+	dprintf("content is %s, file is %s\n", content, file);
 
-	dprintf("open, len %zu\n", len);
-
-	ret = sysfs_write_attribute(attr, content, len);
+	ret = sysfs_write_file(file, content, len);
 
 	dprintf("ret is %d\n", ret);
 
-	sysfs_close_attribute(attr);
-
 	return ret;
 }
 
 static int setup_done(unsigned int socket_no)
 {
-	int ret;
 	char file[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 
 	snprintf(file, SYSFS_PATH_MAX, PATH_TO_SOCKET
 		 "pcmcia_socket%u/available_resources_setup_done",
 		 socket_no);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
-		return -ENODEV;
-
-	ret = sysfs_write_attribute(attr, "42", 2);
-
-	sysfs_close_attribute(attr);
-
-	return ret;
+	return sysfs_write_file(file, "42", 2);
 }
 
 
@@ -130,7 +150,6 @@ static int disallow_irq(unsigned int socket_no, unsigned int irq)
 {
 	char file[SYSFS_PATH_MAX];
 	char content[SYSFS_PATH_MAX];
-	struct sysfs_attribute *attr;
 	unsigned int mask = 0xfff;
 	unsigned int new_mask;
 	int ret;
@@ -144,24 +163,13 @@ static int disallow_irq(unsigned int socket_no, unsigned int irq)
 		 socket_no);
 	dprintf("file is %s\n", file);
 
-	attr = sysfs_open_attribute(file);
-	if (!attr)
+	ret = sysfs_read_file(file, content, SYSFS_PATH_MAX);
+	if (ret)
 		return -ENODEV;
 
-	dprintf("open, len %zu\n", len);
-
-	ret = sysfs_read_attribute(attr);
-	if (ret) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (!attr->value || (attr->len < 6)) {
-		ret = -EIO;
-		goto out;
-	}
-
-	ret = sscanf(attr->value, "0x%x\n", &mask);
+	ret = sscanf(content, "0x%x\n", &mask);
+	if (ret != 1)
+		return -EIO;
 
 	new_mask = 1 << irq;
 
@@ -171,12 +179,7 @@ static int disallow_irq(unsigned int socket_no, unsigned int irq)
 
 	dprintf("content is %s\n", content);
 
-	ret = sysfs_write_attribute(attr, content, len);
-
- out:
-	sysfs_close_attribute(attr);
-
-	return ret;
+	return sysfs_write_file(file, content, len);
 }