diff options
Diffstat (limited to 'gawkapi.c')
| -rw-r--r-- | gawkapi.c | 88 |
1 files changed, 88 insertions, 0 deletions
@@ -25,6 +25,11 @@ #include "awk.h" +/* Declare some globals used by api_get_file: */ +extern IOBUF *curfile; +extern INSTRUCTION *main_beginfile; +extern int currule; + static awk_bool_t node_to_awk_value(NODE *node, awk_value_t *result, awk_valtype_t wanted); /* @@ -1032,6 +1037,86 @@ api_release_value(awk_ext_id_t id, awk_value_cookie_t value) return awk_true; } +/* api_get_file --- return a handle to an existing or newly opened file */ + +static const awk_input_buf_t * +api_get_file(awk_ext_id_t id, const char *name, size_t namelen, const char *filetype, size_t typelen) +{ + const struct redirect *f; + int flag; /* not used, sigh */ + enum redirval redirtype; + + if ((name == NULL) || (namelen == 0)) { + if (curfile == NULL) { + if (nextfile(& curfile, false) <= 0) + return NULL; + { + INSTRUCTION *pc = main_beginfile; + /* save execution state */ + int save_rule = currule; + char *save_source = source; + + while (1) { + if (!pc) + fatal(_("cannot find end of BEGINFILE rule")); + if (pc->opcode == Op_after_beginfile) + break; + pc = pc->nexti; + } + pc->opcode = Op_stop; + (void) (*interpret)(main_beginfile); + pc->opcode = Op_after_beginfile; + after_beginfile(& curfile); + /* restore execution state */ + currule = save_rule; + source = save_source; + } + } + return &curfile->public; + } + redirtype = redirect_none; + switch (typelen) { + case 1: + switch (*filetype) { + case '<': + redirtype = redirect_input; + break; + case '>': + redirtype = redirect_output; + break; + } + break; + case 2: + switch (*filetype) { + case '>': + if (filetype[1] == '>') + redirtype = redirect_append; + break; + case '|': + switch (filetype[1]) { + case '>': + redirtype = redirect_pipe; + break; + case '<': + redirtype = redirect_pipein; + break; + case '&': + redirtype = redirect_twoway; + break; + } + break; + } + } + if (redirtype == redirect_none) { + warning(_("cannot open unrecognized file type `%s' for `%s'"), + filetype, name); + return NULL; + } + if ((f = redirect_string(name, namelen, 0, redirtype, &flag)) == NULL) + return NULL; + return &f->iop->public; +} + /* * Register a version string for this extension with gawk. */ @@ -1117,6 +1202,9 @@ gawk_api_t api_impl = { calloc, realloc, free, + + /* Find/open a file */ + api_get_file, }; /* init_ext_api --- init the extension API */ |