Here are five possible code completions for the given snippet, addressing the CWE-125 (Out-of-bounds Read) vulnerability:

1. Using input validation and bounds checking:

```c
int
main (int argc, char **argv)
{
  int limit;
  /* fixed CWE-125 vulnerability*/
  if (argc != 2) {
    printf("Usage: %s <limit>\n", argv[0]);
    return 1;
  }
  
  limit = atoi(argv[1]);
  if (limit <= 0 || limit > 100) {
    printf("Invalid limit. Please enter a number between 1 and 100.\n");
    return 1;
  }

  int array[100];
  for (int i = 0; i < limit && i < 100; i++) {
    array[i] = i;
    printf("%d ", array[i]);
  }
  printf("\n");

  return 0;
}
```

2. Using dynamic memory allocation:

```c
int
main (int argc, char **argv)
{
  int limit;
  /* fixed CWE-125 vulnerability*/
  if (argc != 2) {
    printf("Usage: %s <limit>\n", argv[0]);
    return 1;
  }
  
  limit = atoi(argv[1]);
  if (limit <= 0) {
    printf("Invalid limit. Please enter a positive number.\n");
    return 1;
  }

  int *array = (int *)malloc(limit * sizeof(int));
  if (array == NULL) {
    printf("Memory allocation failed.\n");
    return 1;
  }

  for (int i = 0; i < limit; i++) {
    array[i] = i;
    printf("%d ", array[i]);
  }
  printf("\n");

  free(array);
  return 0;
}
```

3. Using a constant-size array with bounds checking:

```c
#define MAX_SIZE 1000

int
main (int argc, char **argv)
{
  int limit;
  /* fixed CWE-125 vulnerability*/
  if (argc != 2) {
    printf("Usage: %s <limit>\n", argv[0]);
    return 1;
  }
  
  limit = atoi(argv[1]);
  if (limit <= 0 || limit > MAX_SIZE) {
    printf("Invalid limit. Please enter a number between 1 and %d.\n", MAX_SIZE);
    return 1;
  }

  int array[MAX_SIZE];
  for (int i = 0; i < limit; i++) {
    array[i] = i;
    printf("%d ", array[i]);
  }
  printf("\n");

  return 0;
}
```

4. Using a safer string-to-integer conversion:

```c
int
main (int argc, char **argv)
{
  int limit;
  /* fixed CWE-125 vulnerability*/
  if (argc != 2) {
    printf("Usage: %s <limit>\n", argv[0]);
    return 1;
  }
  
  char *endptr;
  long lLimit = strtol(argv[1], &endptr, 10);
  
  if (*endptr != '\0' || lLimit <= 0 || lLimit > INT_MAX) {
    printf("Invalid limit. Please enter a positive integer.\n");
    return 1;
  }

  limit = (int)lLimit;
  int *array = (int *)malloc(limit * sizeof(int));
  if (array == NULL) {
    printf("Memory allocation failed.\n");
    return 1;
  }

  for (int i = 0; i < limit; i++) {
    array[i] = i;
    printf("%d ", array[i]);
  }
  printf("\n");

  free(array);
  return 0;
}
```

5. Using a vector from C++ Standard Library:

```cpp
#include <vector>
#include <iostream>
#include <string>

int
main (int argc, char **argv)
{
  int limit;
  /* fixed CWE-125 vulnerability*/
  if (argc != 2) {
    std::cout << "Usage: " << argv[0] << " <limit>" << std::endl;
    return 1;
  }
  
  try {
    limit = std::stoi(argv[1]);
  } catch (const std::exception&) {
    std::cout << "Invalid limit. Please enter a valid integer." << std::endl;
    return 1;
  }

  if (limit <= 0) {
    std::cout << "Invalid limit. Please enter a positive number." << std::endl;
    return 1;
  }

  std::vector<int> array(limit);
  for (int i = 0; i < limit; i++) {
    array[i] = i;
    std::cout << array[i] << " ";
  }
  std::cout << std::endl;

  return 0;
}
```

These solutions address the CWE-125 vulnerability by ensuring proper bounds checking, input validation, and memory management.