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KHTTP_TEMPLATE(3) Library Functions Manual KHTTP_TEMPLATE(3) NAME khttp_template, khttp_template_buf, khttp_template_fd -- emit filled-in templates for kcgi LIBRARY library "libkcgi" SYNOPSIS #include <sys/types.h> #include <stdarg.h> #include <stdint.h> #include <kcgi.h> enum kcgi_err khttp_template(struct kreq *req, const struct ktemplate *t, const char *filename); enum kcgi_err khttp_template_buf(struct kreq *req, const struct ktemplate *t, const char *buf, size_t sz); enum kcgi_err khttp_template_fd(struct kreq *req, const struct ktemplate *t, int fd, const char *filename); DESCRIPTION Modify input by replacing keys in a template. May only be called after khttp_body(3). Output is written with khttp_write(3) using the req previously allocated with khttp_parse(3) or khttp_fcgi_parse(3). The khttp_templatex(3) family allows for alternative writers. All functions accept a template t consisting of the following fields: 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. If t is NULL, the input is passed through to khttp_write(3) without any processing. Otherwise, the input is passed to khttp_write(3) 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 unchanged to khttp_write(3). The different input types are khttp_template(), which reads input from the file filename; khttp_template_buf(), which reads from a binary buffer buf of length sz; and khttp_template_fd(), which reads from a file descriptor fd with optional file-name fname used only for logging purposes. SYNTAX Each substring of the input beginning and ending with a pair of "at" signs, @@key@@, is called a "key sequence". Zero-length keys @@@@ are allowed and match empty template keys. If the @@ pair is escaped with a single backslash, \@@, the backslash is removed and it's emitted as @@. A key sequence may not contain an escaped pair: this is parsed as a backslash followed by the trailing pair. RETURN VALUES These return an enum kcgi_err indicating the error state: 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. EXAMPLES The following simple example takes a buffer buf and applies the re- placement template of two values, writing it to the current context req. static int writer(size_t idx, void *arg) { struct kreq *r = arg; if (idx == 0) khttp_puts(r, "foo-value"); else if (idx == 1) khttp_puts(r, "bar-value"); return 1; } enum kcgi_err format(struct kreq *r) { const char *const keys[] = { "foo", "bar" }; struct ktemplate t = { .key = keys, .keysz = 2, .arg = r, .cb = writer }; const char *buf = "foo=@@foo@@, bar=@@bar@@"; return khttp_template_buf(r, &t, buf, strlen(buf)); } The function will produce "foo=foo-value, bar=bar-value". SEE ALSO kcgi(3), khttp_body(3), khttp_parse(3), khttp_templatex(3), khttp_write(3) AUTHORS Written by Kristaps Dzonsons <kristaps@bsd.lv>. FreeBSD Ports 14.quarterly $Mdocdate$ KHTTP_TEMPLATE(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SYNTAX | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHORS
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