Added C code for finding the minimum value in an array

codes/c_lang/min_list/.clang-format

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+

codes/c_lang/min_list/.gitignore

+.vscode
+min_list
+*.o

codes/c_lang/min_list/Makefile

+CC=gcc
+CFLAGS=-g -std=gnu11 -Wall -Wextra -pedantic -fsanitize=address -fsanitize=leak -fsanitize=undefined
+LDFLAGS=-fsanitize=address -fsanitize=leak -fsanitize=undefined
+SOURCES=$(wildcard *.c)
+OBJECTS=$(SOURCES:.c=.o)
+
+TARGET = min_list
+
+all: $(TARGET) 
+
+$(TARGET): $(OBJECTS) 
+	$(CC) $^ -o $@ $(LDFLAGS)
+
+.PHONY = clean
+
+clean:
+	rm -f $(OBJECTS) $(TARGET) 

codes/c_lang/min_list/min_list.c

+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_INT 100
+
+const char *usage_msg =
+    "Error wrong number of arguments.\n"
+    "Usage: ./min_list <num1> <num2> ...\n"
+    "       where <num1>, <num2>, ... must be valid integers.\n";
+
+// Copies the value of the smallest value in the tab array in the min variable.
+// Returns the pointer to a newly allocated value of the minimum value of the
+// array if everything went fine. Returns NULL otherwise
+int *list_find_min(int *tab, int size);
+
+// Prints all the element in the tab array.
+// Returns -1 if size <= 0
+// Returns -2 if tab is NULL
+// Any other value means that everything went fine
+int list_print(int *tab, int size);
+
+// Exits if the error code shows invalidity
+void error_handling(int error_code, int **tab);
+
+// Parses a string to an integer.
+// Returns a pointer to newly allocated data.
+// Returns NULL if conversion failed.
+int *parse_int(char *arg_to_transform);
+
+// Reads the command line inputs and stores them
+// in a newly allocated array.
+// Returns the array with the parsed numbers or NULL if allocation failed or an
+// invalid number was parsed.
+int *read_input(int size, char *char_num[]) {
+    int *tab = malloc(size * sizeof(*tab));
+    if (NULL == tab) {
+        fprintf(stderr, "Memory allocation failed\n");
+        return NULL;
+    }
+    for (int i = 0; i < size; ++i) {
+        int *num = parse_int(char_num[i]);
+        if (NULL == num) {
+            free(tab);
+            fprintf(stderr, "Tried to parse %s which is not a valid integer.\n",
+                    char_num[i]);
+            return NULL;
+        }
+        tab[i] = *num;
+        free(num);
+    }
+    return tab;
+}
+
+int main(int argc, char *argv[]) {
+    if (argc == 1) {
+        fprintf(stderr,
+                "Error wrong number of arguments.\n"
+                "%s",
+                usage_msg);
+        return EXIT_FAILURE;
+    }
+
+    int size = argc - 1;
+    int *tab = read_input(size, &argv[1]);
+    if (NULL == tab) {
+        fprintf(stderr, "Failure during argument parsing.\n");
+        return EXIT_FAILURE;
+    }
+
+    printf("Among the numbers in the list:\n");
+    error_handling(list_print(tab, size), &tab);
+    int *min = list_find_min(tab, size);
+    if (NULL == min) {
+        fprintf(stderr, "Could not find the minimum of the array.\n");
+        free(tab);
+        tab = NULL;
+        return EXIT_FAILURE;
+    }
+    printf("The value of the minimum of the numbers is: %d\n", *min);
+
+    free(min);
+    free(tab);
+    tab = NULL;
+
+    return EXIT_SUCCESS;
+}
+
+// Checks if size is valid and tab is not NULL
+int list_is_valid(int *tab, int size) {
+    if (size <= 0) {
+        return -1;
+    }
+    if (NULL == tab) {
+        return -2;
+    }
+    return 0;
+}
+
+int list_print(int *tab, int size) {
+    int code = list_is_valid(tab, size);
+    if (code < 0) {
+        return code;
+    }
+
+    for (int i = 0; i < size; ++i) {
+        printf("%d ", tab[i]);
+    }
+    printf("\n");
+    return code;
+}
+
+int *list_find_min(int *tab, int size) {
+    int code = list_is_valid(tab, size);
+    if (code < 0) {
+        return NULL;
+    }
+
+    int *min = malloc(sizeof(*min));
+    *min = tab[0];
+    for (int i = 1; i < size; ++i) {
+        if (tab[i] < *min) {
+            *min = tab[i];
+        }
+    }
+    return min;
+}
+
+void error_handling(int error_code, int **tab) {
+    switch (error_code) {
+        case -1:
+            fprintf(stderr, "Return value, %d. Size is <= 0.\n", error_code);
+            free(*tab);
+            *tab = NULL;
+            exit(EXIT_FAILURE);
+            break;
+        case -2:
+            fprintf(stderr, "Tab is NULL.\n");
+            free(*tab);
+            *tab = NULL;
+            exit(EXIT_FAILURE);
+            break;
+        default:
+            break;
+    }
+}
+
+int *parse_int(char *arg_to_transform) {
+    if (strlen(arg_to_transform) == 0) {
+        return NULL;  // empty string to parse
+    }
+    char *remaining;
+    errno = 0;  // errno == 0 (defined in errno.h) means everything went fine
+    long arg = strtol(arg_to_transform, &remaining,
+                      10);  // number is parsed in base 10
+    if (*remaining != '\0' || errno != 0) {
+        return NULL;  // Empty string parsed or an error occurred
+    }
+
+    if (arg < INT_MIN || arg > INT_MAX) {
+        return NULL;  // Not within the limits of an int
+    }
+    int *num = malloc(sizeof(*num));
+    *num = (int)arg;
+    return num;
+}