libvips

VIPS_BUF_STATIC()

#define             VIPS_BUF_STATIC( TEXT )

Initialize a heap buffer. For example:

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char txt[256];
VipsBuf buf = VIPS_BUF_STATIC (txt);

vips_buf_rewind ()

void
vips_buf_rewind (VipsBuf *buf);

Reset the buffer to the empty string.

vips_buf_destroy ()

void
vips_buf_destroy (VipsBuf *buf);

Destroy a buffer. Only needed for heap buffers. Leaves the buffer in the _init state.

vips_buf_init ()

void
vips_buf_init (VipsBuf *buf);

Initialize a buffer.

vips_buf_set_static ()

void
vips_buf_set_static (VipsBuf *buf,
                     char *base,
                     int mx);

Attach the buffer to a static memory area. The buffer needs to have been initialised. The memory area needs to be at least 4 bytes long.

vips_buf_set_dynamic ()

void
vips_buf_set_dynamic (VipsBuf *buf,
                      int mx);

Attach the buffer to a heap memory area. The buffer needs to have been initialised. The memory area needs to be at least 4 bytes long.

vips_buf_init_static ()

void
vips_buf_init_static (VipsBuf *buf,
                      char *base,
                      int mx);

Initialise and attach to a static memory area. VIPS_BUF_STATIC() is usually more convenient.

For example:

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char txt[256];
VipsBuf buf;

vips_buf_init_static (&buf, txt, 256);

Static buffers don't need to be freed when they go out of scope, but their size must be set at compile-time.

vips_buf_init_dynamic ()

void
vips_buf_init_dynamic (VipsBuf *buf,
                       int mx);

Initialise and attach to a heap memory area. The memory area needs to be at least 4 bytes long.

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VipsBuf buf;

vips_buf_init_synamic (&buf, 256);

Dynamic buffers must be freed with vips_buf_destroy(), but their size can be set at runtime.

vips_buf_appendns ()

gboolean
vips_buf_appendns (VipsBuf *buf,
                   const char *str,
                   int sz);

Append at most sz chars from str to buf . sz < 0 means unlimited. This is the low-level append operation: functions like vips_buf_appendf() build on top of this.

vips_buf_appends ()

gboolean
vips_buf_appends (VipsBuf *buf,
                  const char *str);

Append the whole of str to buf .

vips_buf_appendf ()

gboolean
vips_buf_appendf (VipsBuf *buf,
                  const char *fmt,
                  ...);

Format the string and append to buf .

vips_buf_vappendf ()

gboolean
vips_buf_vappendf (VipsBuf *buf,
                   const char *fmt,
                   va_list ap);

Append to buf , args as vprintf().

vips_buf_appendc ()

gboolean
vips_buf_appendc (VipsBuf *buf,
                  char ch);

Append a single character ch to buf .

vips_buf_appendsc ()

gboolean
vips_buf_appendsc (VipsBuf *buf,
                   gboolean quote,
                   const char *str);

vips_buf_appendgv ()

gboolean
vips_buf_appendgv (VipsBuf *buf,
                   GValue *value);

Format and append a GValue as a printable thing. We display text line "3144 bytes of binary data" for BLOBs like icc-profile-data.

Use vips_image_get_as_string() to make a text representation of a field. That will base64-encode blobs, for example.

vips_buf_append_size ()

gboolean
vips_buf_append_size (VipsBuf *buf,
                      size_t n);

Turn a number of bytes into a sensible string ... eg "12", "12KB", "12MB", "12GB" etc.

vips_buf_removec ()

gboolean
vips_buf_removec (VipsBuf *buf,
                  char ch);

Remove the last character, if it's ch .

vips_buf_change ()

gboolean
vips_buf_change (VipsBuf *buf,
                 const char *o,
                 const char *n);

Swap the rightmost occurence of o for n .

vips_buf_is_empty ()

gboolean
vips_buf_is_empty (VipsBuf *buf);

vips_buf_is_full ()

gboolean
vips_buf_is_full (VipsBuf *buf);

vips_buf_all ()

const char *
vips_buf_all (VipsBuf *buf);

Return the contents of the buffer as a C string.

vips_buf_firstline ()

const char *
vips_buf_firstline (VipsBuf *buf);

Trim to just the first line (excluding "\n").

vips_buf_appendg ()

gboolean
vips_buf_appendg (VipsBuf *buf,
                  double g);

Append a double, non-localised. Useful for config files etc.

vips_buf_appendd ()

gboolean
vips_buf_appendd (VipsBuf *buf,
                  int d);

Append a number. If the number is -ve, add brackets. Needed for building function arguments.

vips_buf_len ()

int
vips_buf_len (VipsBuf *buf);

VipsBuf

typedef struct {
	/* All fields are private.
	 */
} VipsBuf;