YAZ provides a fast utility for working with MARC records. Early versions of the MARC utility only allowed decoding of ISO2709. Today the utility may both encode - and decode to a variety of formats.

    #include <yaz/marcdisp.h>

    /* create handler */
    yaz_marc_t yaz_marc_create(void);
    /* destroy */
    void yaz_marc_destroy(yaz_marc_t mt);

    /* set XML mode YAZ_MARC_LINE, YAZ_MARC_SIMPLEXML, ... */
    void yaz_marc_xml(yaz_marc_t mt, int xmlmode);
    #define YAZ_MARC_LINE      0
    #define YAZ_MARC_SIMPLEXML 1
    #define YAZ_MARC_OAIMARC   2
    #define YAZ_MARC_MARCXML   3
    #define YAZ_MARC_ISO2709   4
    #define YAZ_MARC_XCHANGE   5
    #define YAZ_MARC_CHECK     6
    #define YAZ_MARC_TURBOMARC 7
    #define YAZ_MARC_JSON      8

    /* supply iconv handle for character set conversion .. */
    void yaz_marc_iconv(yaz_marc_t mt, yaz_iconv_t cd);

    /* set debug level, 0=none, 1=more, 2=even more, .. */
    void yaz_marc_debug(yaz_marc_t mt, int level);

    /* decode MARC in buf of size bsize. Returns >0 on success; <=0 on failure.
    On success, result in *result with size *rsize. */
    int yaz_marc_decode_buf(yaz_marc_t mt, const char *buf, int bsize,
                            const char **result, size_t *rsize);

    /* decode MARC in buf of size bsize. Returns >0 on success; <=0 on failure.
       On success, result in WRBUF */
    int yaz_marc_decode_wrbuf(yaz_marc_t mt, const char *buf,
                              int bsize, WRBUF wrbuf);

   

A MARC conversion handle must be created by using yaz_marc_create and destroyed by calling yaz_marc_destroy.

All other functions operate on a yaz_marc_t handle. The output is specified by a call to yaz_marc_xml. The xmlmode must be one of

The actual conversion functions are yaz_marc_decode_buf and yaz_marc_decode_wrbuf which decodes and encodes a MARC record. The former function operates on simple buffers, and stores the resulting record in a WRBUF handle (WRBUF is a simple string type).

      void print_marc(const char *marc_buf, int marc_buf_size)
      {
         char *result;      /* for result buf */
         size_t result_len;    /* for size of result */
         yaz_marc_t mt = yaz_marc_create();
         yaz_marc_xml(mt, YAZ_MARC_LINE);
         yaz_marc_decode_buf(mt, marc_buf, marc_buf_size,
                             &result, &result_len);
         fwrite(result, result_len, 1, stdout);
         yaz_marc_destroy(mt);  /* note that result is now freed... */
      }