agrego practicas

c/args/main.c

@@ -0,0 +1,73 @@
+#include <limits.h>
+#include <errno.h>
+#include<stdio.h>
+#include <stdlib.h>
+#include<unistd.h>
+#include<getopt.h>
+
+
+static struct option option_args[] = {
+    {"help", no_argument, 0, 'h' },
+    {"verbose", no_argument, 0, 'v' },
+    {"output", required_argument, 0, 'o' },
+    {"max", required_argument, 0, 'm' },
+    {0,0,0,0}
+};
+
+void print_usage(char* arg){
+    fprintf(stdout, "Uso: %s\n", arg);
+    fprintf(stdout, "[--help]\n");
+    fprintf(stdout, "[--verbose]\n");
+    fprintf(stdout, "[--output <archivo>]\n");
+    fprintf(stdout, "[--max <num>]\n");
+    fprintf(stdout, "[posicionales...]\n");
+}
+
+int main(int argc, char* argv[]){
+
+    printf("argv[0]: %s\n", argv[0]);
+
+    int opt;
+    int opt_index = 0;
+
+    while((opt = getopt_long(argc, argv, "hvo:m:", option_args, &opt_index)) != -1){
+        switch (opt){
+            case 'h':
+                print_usage(argv[0]);
+                exit(0);
+                break;
+            case 'v':
+                fprintf(stdout, "Modo verbose: ON\n");
+                break;
+            case 'o':
+                fprintf(stdout, "Output: %s\n", optarg);
+                break;
+            case 'm':
+                errno = 0;
+                char* errorptr = NULL;
+                long maximo = strtol(optarg, &errorptr, 10);
+                if(    (errno == EINVAL) 
+                    || (errno == ERANGE) 
+                    || (*errorptr != 0)
+                    || (maximo < INT_MIN)
+                    || (maximo > INT_MAX)
+                ){
+                    fprintf(stderr, "--max debe ser un numero entero valido.\n");
+                    exit(1);
+                }
+                printf("Maximo:%ld\n", maximo);
+                break;
+            case '?':
+                print_usage(argv[0]);
+                exit(1);
+                break;
+        }
+    }
+
+    fprintf(stdout, "Posicionales:\n");
+    for(int i = optind; i < argc; i++){
+        fprintf(stdout, "%s\n", argv[i]);
+    }
+
+    return 0;
+}