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prop.h
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/* prop.h -- property request/response management routines * * Author: Chris Newman * Removal of implementation-specific details by: Rob Siemborski * * This is intended to be used to create a list of properties to request, * and _then_ request values for all properties. Any change to the request * list will discard any existing values. This assumption allows a very * efficient and simple memory model. This was designed for SASL API auxiliary * property support, but would be fine for other contexts where this property * model is appropriate. * * The "struct propctx" is allocated by prop_new and is a fixed size structure. * If a prop_init() call were added, it would be reasonable to embed a "struct * propctx" in another structure. prop_new also allocates a pool of memory * (in the vbase field) which will be used for an array of "struct propval" * to list all the requested properties. * * Properties may be multi-valued. */ #ifndef PROP_H #define PROP_H 1 /* The following ifdef block is the standard way of creating macros * which make exporting from a DLL simpler. All files within this DLL * are compiled with the LIBSASL_EXPORTS symbol defined on the command * line. this symbol should not be defined on any project that uses * this DLL. This way any other project whose source files include * this file see LIBSASL_API functions as being imported from a DLL, * wheras this DLL sees symbols defined with this macro as being * exported. */ /* Under Unix, life is simpler: we just need to mark library functions * as extern. (Technically, we don't even have to do that.) */ #ifdef WIN32 # ifdef LIBSASL_EXPORTS # define LIBSASL_API extern __declspec(dllexport) # else /* LIBSASL_EXPORTS */ # define LIBSASL_API extern __declspec(dllimport) # endif /* LIBSASL_EXPORTS */ #else /* WIN32 */ # define LIBSASL_API extern #endif /* WIN32 */ /* Same as above, but used during a variable declaration. */ #ifdef WIN32 # ifdef LIBSASL_EXPORTS # define LIBSASL_VAR extern __declspec(dllexport) # else /* LIBSASL_EXPORTS */ # define LIBSASL_VAR extern __declspec(dllimport) # endif /* LIBSASL_EXPORTS */ #else /* WIN32 */ # define LIBSASL_VAR extern #endif /* WIN32 */ /* the resulting structure for property values */ struct propval { const char *name; /* name of property; NULL = end of list */ /* same pointer used in request will be used here */ const char **values; /* list of strings, values == NULL if property not * found, *values == NULL if property found with * no values */ unsigned nvalues; /* total number of value strings */ unsigned valsize; /* total size in characters of all value strings */ }; /* * private internal structure */ #define PROP_DEFAULT 4 /* default number of propvals to assume */ struct propctx; #ifdef __cplusplus extern "C" { #endif /* create a property context * estimate -- an estimate of the storage needed for requests & responses * 0 will use module default * returns a new property context on success and NULL on any error */ LIBSASL_API struct propctx *prop_new(unsigned estimate); /* create new propctx which duplicates the contents of an existing propctx * returns SASL_OK on success * possible other return values include: SASL_NOMEM, SASL_BADPARAM */ LIBSASL_API int prop_dup(struct propctx *src_ctx, struct propctx **dst_ctx); /* Add property names to request * ctx -- context from prop_new() * names -- list of property names; must persist until context freed * or requests cleared (This extends to other contexts that * are dup'ed from this one, and their children, etc) * * NOTE: may clear values from context as side-effect * returns SASL_OK on success * possible other return values include: SASL_NOMEM, SASL_BADPARAM */ LIBSASL_API int prop_request(struct propctx *ctx, const char **names); /* return array of struct propval from the context * return value persists until next call to * prop_request, prop_clear or prop_dispose on context * * returns NULL on error */ LIBSASL_API const struct propval *prop_get(struct propctx *ctx); /* Fill in an array of struct propval based on a list of property names * return value persists until next call to * prop_request, prop_clear or prop_dispose on context * returns number of matching properties which were found (values != NULL) * if a name requested here was never requested by a prop_request, then * the name field of the associated vals entry will be set to NULL * * The vals array MUST be atleast as long as the names array. * * returns # of matching properties on success * possible other return values include: SASL_BADPARAM */ LIBSASL_API int prop_getnames(struct propctx *ctx, const char **names, struct propval *vals); /* clear values and optionally requests from property context * ctx -- property context * requests -- 0 = don't clear requests, 1 = clear requests */ LIBSASL_API void prop_clear(struct propctx *ctx, int requests); /* erase the value of a property */ LIBSASL_API void prop_erase(struct propctx *ctx, const char *name); /* dispose of property context * ctx -- is disposed and set to NULL; noop if ctx or *ctx is NULL */ LIBSASL_API void prop_dispose(struct propctx **ctx); /****fetcher interfaces****/ /* format the requested property names into a string * ctx -- context from prop_new()/prop_request() * sep -- separator between property names (unused if none requested) * seplen -- length of separator, if < 0 then strlen(sep) will be used * outbuf -- output buffer * outmax -- maximum length of output buffer including NUL terminator * outlen -- set to length of output string excluding NUL terminator * returns SASL_OK on success * returns SASL_BADPARAM or amount of additional space needed on failure */ LIBSASL_API int prop_format(struct propctx *ctx, const char *sep, int seplen, char *outbuf, unsigned outmax, unsigned *outlen); /* add a property value to the context * ctx -- context from prop_new()/prop_request() * name -- name of property to which value will be added * if NULL, add to the same name as previous prop_set/setvals call * value -- a value for the property; will be copied into context * if NULL, remove existing values * vallen -- length of value, if <= 0 then strlen(value) will be used * returns SASL_OK on success * possible error return values include: SASL_BADPARAM, SASL_NOMEM */ LIBSASL_API int prop_set(struct propctx *ctx, const char *name, const char *value, int vallen); /* set the values for a property * ctx -- context from prop_new()/prop_request() * name -- name of property to which value will be added * if NULL, add to the same name as previous prop_set/setvals call * values -- array of values, ending in NULL. Each value is a NUL terminated * string * returns SASL_OK on success * possible error return values include: SASL_BADPARAM, SASL_NOMEM */ LIBSASL_API int prop_setvals(struct propctx *ctx, const char *name, const char **values); #ifdef __cplusplus } #endif #endif /* PROP_H */