complete lab07

lab07/Makefile

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+# Compiler and flags
+CC = gcc
+CFLAGS = -Wall -std=c11
+
+#Input file
+INPUT = input1.txt
+OUTPUT = output.txt
+REF = ref1.txt
+# Source file
+SRCS = lab7.c
+# Output
+TARGET = lab7.out
+
+# Default target
+all: $(TARGET)
+
+# Rule to build the executable
+$(TARGET): $(SRCS)
+	$(CC) $(CFLAGS) $(SRCS) -o $(TARGET)
+
+convert_input: $(INPUT)
+	cat $(INPUT) | dos2unix | tee $(INPUT)
+	@tail -c1 $(INPUT) | grep -q . && echo >> $(INPUT)
+	tr -d '\r' < $(INPUT) > temp_file && mv temp_file $(INPUT)
+
+convert_output: $(OUTPUT)
+	cat $(OUTPUT) | dos2unix | tee $(OUTPUT)
+	$(tail -c1 ($INPUT)) != ""  && echo >> $(INPUT)
+	tr -d '\r' < $(OUTPUT) > temp_file && mv temp_file $(OUTPUT)
+
+check: $(OUTPUT) $(REF)
+	@diff -q $(OUTPUT) $(REF) > /dev/null; \
+	if [ $$? -eq 0 ]; then \
+		echo "Pass"; \
+	else \
+		echo "Fail"; \
+	fi
+
+# Rule to run the program
+run: $(TARGET)
+	./$(TARGET) $(INPUT) $(OUTPUT)
+
+# Rule to clean generated files
+clean:
+	rm -f $(TARGET)

lab07/input.txt

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+8
+E

lab07/input1.txt

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+8
+126
+-5
+E

lab07/lab7.c

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+#include <stdint.h>
+#include <stdio.h>
+
+#define SIGN_MASK 0x0000000000000001
+
+long getClamp(long q, long min, long max)
+{
+    long diffToMin;
+    long diffToMax;
+    long diffToMinSign;
+    long diffToMaxSign;
+
+    diffToMin = q + (~min + 1);
+    diffToMax = q + (~max + 1);
+    diffToMinSign = (diffToMin >> 63) & SIGN_MASK;
+    diffToMaxSign = (diffToMax >> 63) & SIGN_MASK;
+
+    // If diff to min is 0, or the diff to min
+    // is greater than the min (positive sign),
+    // then check max
+    if (diffToMin == 0 || diffToMinSign == 0)
+    {
+        // if the diff to min is 0, or the diff to max
+        // is less than the min, (negative sign),
+        // return q
+        // otherwise return max
+        return (diffToMax == 0 || diffToMaxSign == 1) ? q : max;
+    }
+
+    return min;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc != 3)
+    {
+        perror("Usage: lab5.c <input_file> <output_file>\n");
+        return 1;
+    }
+
+    char *inputPath;
+    char *outputPath;
+    FILE *inputFile;
+    FILE *outputFile;
+
+    inputPath  = argv[1];
+    outputPath = argv[2];
+    inputFile  = fopen(inputPath, "r");
+    outputFile = fopen(outputPath, "w");
+
+    if (inputFile == NULL || outputFile == NULL)
+    {
+        perror("Failed to open file");
+        return 1;
+    }
+
+    long bits;
+    long min;
+    long max;
+    long x;
+    long y;
+    long q;
+    long result;
+
+    fscanf(inputFile, "%ld", &bits);
+    fscanf(inputFile, "%ld", &x);
+    fscanf(inputFile, "%ld", &y);
+
+    min = (1 << (bits - 1)) * -1;
+    max = (1 << (bits - 1)) - 1;
+
+    if (x == 0 && y == 0)
+    {
+        fprintf(outputFile, "min: %ld\t0x%016lx\n", min, min);
+        fprintf(outputFile, "max: %ld\t0x%016lx\n", max, max);
+    }
+    else
+    {
+        q = x * y;
+
+        result = getClamp(q, min, max);
+
+        fprintf(outputFile, "%ld\n", result);
+    }
+
+    fclose(inputFile);
+    fclose(outputFile);
+
+    return 0;
+}

lab07/output.txt

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+-128

lab07/ref.txt

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+min: -128	0xffffffffffffff80
+max: 127	0x000000000000007f

lab07/ref1.txt

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+-128