NAME

LIBRARY

SYNOPSIS

enum kcgi_err
khttp_templatex(const struct ktemplate *t, const char *filename, const struct ktemplatex *x, void *arg);

enum kcgi_err
khttp_templatex_buf(const struct ktemplate *t, const char *buf, size_t sz, const struct ktemplatex *x, void *arg);

enum kcgi_err
khttp_templatex_fd(const struct ktemplate *t, int fd, const char *filename, const struct ktemplatex *x, void *arg);

DESCRIPTION

const char *const *key

An array of keys to be replaced in the template.

size_t keysz

The number of keys in t->key.

void *arg

An optional argument passed to t->cb.

int (*cb)(size_t index, void *arg)

The callback function invoked when a key at position index, which is always less than t->keysz, is found in t->key. The optional arg is passed the function. The function must return zero on failure, non-zero on success.

They further accept an extension x consisting of the following:

writer

A writing function for writing input that does not match key sequences. If it is invoked and the return value is not KCGI_OK, templating stops and the return value is returned to the caller.

fbk

A fall-back function invoked if a key sequences was not found in the c->key array. This accepts the key sequence, length of the sequence, and arg. If NULL, key sequences not found are passed to writer.

If t is NULL, the input is passed through to x->writer without any processing.

Otherwise, the input is passed to x->writer until a key sequence in encountered matching a key in t->key. The callback t->cb is then invoked instead of printing the key sequence. If there are multiple matching keys in t->key, only one is used (which is not yet fixed). If the key sequence is not found in t->key, it is passed to x->fbk, if not NULL, or passed directly to x->writer otherwise.

The different input types are khttpx_template(), which reads input from the file filename; khttpx_template_buf(), which reads from a binary buffer buf of length sz; and khttpx_template_fd(), which reads from a file descriptor fd with optional file-name fname used only for logging purposes.

SYNTAX

A key sequence may not contain an escaped pair: this is parsed as a backslash followed by the trailing pair.

RETURN VALUES

KCGI_OK

No error occurred.

KCGI_ENOMEM

Memory allocation failed.

KCGI_SYSTEM

A system call failed. For example, writing to the output stream failed, or khttp_template() failed to open(2) filename.

KCGI_FORM

t->cb returned 0.

If the x->writer function returns anything but KCGI_OK, the return code is passed as the return value.

EXAMPLES

static int writer(size_t idx, void *arg)
{
  struct kcgi_buf *p = arg;
  if (idx == 0)
    kcgi_buf_puts(p, "foo-value");
  else if (idx == 1)
    kcgi_buf_puts(p, "bar-value");
  return 1;
}

enum kcgi_err format(struct kcgi_buf *out)
{
  const char *const keys[] = { "foo", "bar" };
  struct ktemplate t = {
    .key = keys,
    .keysz = 2,
    .arg = out,
    .cb = writer
  };
  struct ktemplatex x = {
    .writer = kcgi_buf_write,
    .fbk = NULL
  };
  const char *in = "foo=@@foo@@, bar=@@bar@@";

  memset(&out, 0, sizeof(struct kcgi_buf));
  return khttp_templatex_buf
    (&t, in, strlen(in), &x, out);
}

The function will produce “foo=foo-value, bar=bar-value”.

SEE ALSO

AUTHORS