diff options
| -rw-r--r-- | buffer.c | 3 | ||||
| -rw-r--r-- | buffer.h | 10 |
2 files changed, 9 insertions, 4 deletions
@@ -11,9 +11,12 @@ void buffer_init(Buffer *buf) { } bool buffer_grow(Buffer *buf, size_t size) { + /* ensure minimal buffer size, to avoid repeated realloc(3) calls */ if (size < BUF_SIZE) size = BUF_SIZE; if (buf->size < size) { + /* if this is not the first allocation i.e. the buffer is + * currently full, double the size to avoid memory pressure */ if (buf->size > 0) size *= 2; char *data = realloc(buf->data, size); @@ -5,15 +5,16 @@ #include <stdbool.h> #include "text.h" -typedef struct { /* a dynamically growing buffer storing arbitrary data */ +/* a dynamically growing buffer storing arbitrary data, used for registers/macros */ +typedef struct { char *data; /* NULL if empty */ size_t len; /* current length of data */ size_t size; /* maximal capacity of the buffer */ } Buffer; -/* initalize a (stack allocated) Buffer insteance */ +/* initalize a (stack allocated) Buffer instance */ void buffer_init(Buffer*); -/* relase/free all data stored in this buffer, reset size to zero */ +/* release/free all data stored in this buffer, reset size to zero */ void buffer_release(Buffer*); /* reserve space to store at least size bytes in this buffer.*/ bool buffer_grow(Buffer*, size_t size); @@ -31,8 +32,9 @@ bool buffer_insert0(Buffer*, size_t pos, const char *data); bool buffer_append(Buffer*, const void *data, size_t len); /* append NUl-terminated data */ bool buffer_append0(Buffer*, const char *data); - +/* insert new data at the start of the buffer */ bool buffer_prepend(Buffer*, const void *data, size_t len); +/* prepend NUL-terminated data */ bool buffer_prepend0(Buffer*, const char *data); #endif |