Here are five possible code completions for the given function:

### 1. Basic Element Content Dump

```c
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob) {
    if (content == NULL) return;
    if (content->type == XML_ELEMENT_CONTENT_TEXT) {
        xmlBufferWrite(buf, content->content.text, content->content.textLen);
    } else if (content->type == XML_ELEMENT_CONTENT_ELEMENT) {
        xmlDumpElement(buf, content->content.element, glob);
    }
}
```

### 2. Recursive Element Content Dump

```c
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob) {
    if (content == NULL) return;
    if (content->type == XML_ELEMENT_CONTENT_TEXT) {
        xmlBufferWrite(buf, content->content.text, content->content.textLen);
    } else if (content->type == XML_ELEMENT_CONTENT_ELEMENT) {
        xmlDumpElement(buf, content->content.element, glob);
        xmlDumpElementContent(buf, content->next, glob);
    } else if (content->type == XML_ELEMENT_CONTENT_SEQ) {
        xmlDumpElementContent(buf, content->content.seq, glob);
    }
}
```

### 3. Element Content Dump with Error Handling

```c
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob) {
    if (content == NULL) return;
    if (buf == NULL) {
        xmlGenericError(xmlGenericErrorContext, "xmlBufferPtr is NULL");
        return;
    }
    if (content->type == XML_ELEMENT_CONTENT_TEXT) {
        if (xmlBufferWrite(buf, content->content.text, content->content.textLen) < 0) {
            xmlGenericError(xmlGenericErrorContext, "Failed to write to xmlBuffer");
        }
    } else if (content->type == XML_ELEMENT_CONTENT_ELEMENT) {
        xmlDumpElement(buf, content->content.element, glob);
    }
}
```

### 4. Element Content Dump with Formatting

```c
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob) {
    if (content == NULL) return;
    if (content->type == XML_ELEMENT_CONTENT_TEXT) {
        xmlBufferWrite(buf, content->content.text, content->content.textLen);
        if (glob) {
            xmlBufferWrite(buf, "\n", 1);
        }
    } else if (content->type == XML_ELEMENT_CONTENT_ELEMENT) {
        xmlDumpElement(buf, content->content.element, glob);
        if (glob) {
            xmlBufferWrite(buf, "\n", 1);
        }
    }
}
```

### 5. Element Content Dump with Indentation

```c
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob, int indent) {
    if (content == NULL) return;
    if (content->type == XML_ELEMENT_CONTENT_TEXT) {
        for (int i = 0; i < indent; i++) {
            xmlBufferWrite(buf, "  ", 2);
        }
        xmlBufferWrite(buf, content->content.text, content->content.textLen);
        if (glob) {
            xmlBufferWrite(buf, "\n", 1);
        }
    } else if (content->type == XML_ELEMENT_CONTENT_ELEMENT) {
        xmlDumpElement(buf, content->content.element, glob, indent + 1);
        if (glob) {
            xmlBufferWrite(buf, "\n", 1);
        }
    }
}
```