Nahrány soubory do „/“

Makefile

@@ -0,0 +1,17 @@
+CC = gcc
+CFLAGS = -Wall -pedantic -Werror -std=c99 -O2
+target = rc-status-memory
+source = main.c
+
+$(target): Makefile $(source)
+	$(CC) $(CFLAGS) -o $(target) $(source)
+
+.PHONY : clean
+clean:
+	@echo "provadim clean"
+	rm -f $(target)
+
+install: $(target)
+	@echo "Instaluji"
+	cp -f $(target) /usr/local/bin
+	sync

main.c

@@ -0,0 +1,157 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ * * Neither the name of the  nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+/*
+ * parametry
+ * -v delsi vypis
+ * -s simple - usporny vypis
+ * -l[label] vlastni nadpis
+ * -p vypis v procentech
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <string.h>
+#include <strings.h>
+
+#define MAX_LABEL_LENGTH 32
+#define MEMORY_INFO_PERCENT 1
+#define MEMORY_INFO_VERBOSE 2
+
+static void show_help(void)
+{
+	puts("parametry:");
+	puts("  -p  zobrazi hodnoty v procentech");
+	puts("  -v  podrobnejsi vypis");
+	puts("  -s  kratky vypis");
+	puts("  -l <nadpis>");
+}
+
+static int print_output(const char *szlabel, uint_fast32_t params)
+{
+	FILE *pfile = fopen("/proc/meminfo", "r");
+	if (NULL == pfile) {
+		printf("ERROR");
+		return EXIT_FAILURE;
+	}
+	char line[256];
+	unsigned int mem_total = 0;
+	unsigned int mem_avail = 0;
+	unsigned int swap_total = 0;
+	unsigned int swap_free = 0;
+	unsigned int end = 0;
+	while (fgets(line, sizeof(line), pfile)) {
+		if (sscanf(line, "MemTotal: %u kB", &mem_total) == 1) {
+			end |= 1;
+			continue;
+		}
+		if (sscanf(line, "MemAvailable: %u kB", &mem_avail) == 1) {
+			end |= 2;
+			continue;
+		}
+		if (sscanf(line, "SwapTotal: %u kB", &swap_total) == 1) {
+			end |= 4;
+			continue;
+		}
+		if (sscanf(line, "SwapFree: %u kB", &swap_free) == 1) {
+			end |= 8;
+			continue;
+		}
+		if (0xF == end)
+			break;
+	}
+	fclose(pfile);
+	if (0 == mem_total)
+		return EXIT_FAILURE;
+	char sztext[32];
+	char outbuff[64 + MAX_LABEL_LENGTH];
+	*sztext = 0;
+	*outbuff = 0;
+	if ((NULL != szlabel) && (*szlabel != 0)) {
+		strncat(outbuff, szlabel,
+			sizeof(outbuff) - strlen(outbuff) - 1);
+		strncat(outbuff, " ", sizeof(outbuff) - strlen(outbuff) - 1);
+	}
+	if (MEMORY_INFO_PERCENT & params) {
+		sprintf(sztext, "%u", 100*(mem_total - mem_avail) / mem_total);
+		strncat(sztext, "%", sizeof(outbuff) - strlen(outbuff) - 1);
+	} 
+	else {
+		sprintf(sztext, (MEMORY_INFO_VERBOSE & params) ? "%.2f GiB" :  "%.2f",
+			(double)(mem_total - mem_avail) / (1024 * 1024));
+	}
+	strncat(outbuff, sztext, sizeof(outbuff) - strlen(outbuff) - 1);
+	if (0 == swap_total)
+		return EXIT_SUCCESS;
+	if (MEMORY_INFO_PERCENT & params) {
+		sprintf(sztext, " %u", 100*(swap_total - swap_free) / swap_total);
+		strncat(sztext, "%", sizeof(outbuff) - strlen(outbuff) - 1);
+	}
+	else
+		sprintf(sztext, (MEMORY_INFO_VERBOSE & params) ? " - %.2f GiB" : " %.2f G",
+			(double)(swap_total - swap_free) / (1024 * 1024));
+	strncat(outbuff, sztext, sizeof(outbuff) - strlen(outbuff) - 1);
+	puts(outbuff);
+	return EXIT_SUCCESS;
+}
+
+int main(int argc, char **argv)
+{
+	int opt;
+	uint_fast32_t params = 0;
+	char szlabel[MAX_LABEL_LENGTH];
+	*szlabel = 0;
+	if (argc > 1) {
+		while ((opt = getopt(argc, argv, "vsphl:")) != -1) {
+			switch (opt) {
+			case 'l':
+				if (strlen(optarg) <= sizeof(szlabel) - 1)
+					strncpy(szlabel, optarg,
+						sizeof(szlabel) - strlen(szlabel) - 1);
+				break;
+			case 'p':
+				params |= MEMORY_INFO_PERCENT;
+				break;
+			case 's':
+				params &= ~MEMORY_INFO_VERBOSE;
+				break;
+			case 'v':
+				params |= MEMORY_INFO_VERBOSE;
+				break;
+			case 'h':
+				show_help();
+				return EXIT_SUCCESS;
+				break;
+			}
+		}
+	}
+	return print_output(szlabel, params);
+}