From 88751e9e5ee3726b8a6987aeaae04e956c2234f5 Mon Sep 17 00:00:00 2001 From: midipix Date: Mon, 27 Jan 2020 08:36:51 -0500 Subject: created lib-app skeleton (foss21.org lib-app model). --- src/driver/tpax_driver_ctx.c | 248 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 248 insertions(+) create mode 100644 src/driver/tpax_driver_ctx.c (limited to 'src/driver/tpax_driver_ctx.c') diff --git a/src/driver/tpax_driver_ctx.c b/src/driver/tpax_driver_ctx.c new file mode 100644 index 0000000..96fe8ff --- /dev/null +++ b/src/driver/tpax_driver_ctx.c @@ -0,0 +1,248 @@ +/******************************************************/ +/* tpax: a topological pax implementation */ +/* Copyright (C) 2020 Z. Gilboa */ +/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */ +/******************************************************/ + +#include +#include +#include + +#define ARGV_DRIVER + +#include +#include "tpax_version.h" +#include "tpax_driver_impl.h" +#include "argv/argv.h" + +/* package info */ +static const struct tpax_source_version tpax_src_version = { + TPAX_TAG_VER_MAJOR, + TPAX_TAG_VER_MINOR, + TPAX_TAG_VER_PATCH, + TPAX_GIT_VERSION +}; + +/* default fd context */ +static const struct tpax_fd_ctx tpax_default_fdctx = { + .fdin = STDIN_FILENO, + .fdout = STDOUT_FILENO, + .fderr = STDERR_FILENO, + .fdcwd = AT_FDCWD, + .fddst = AT_FDCWD, + .fdlog = (-1), +}; + +struct tpax_driver_ctx_alloc { + struct argv_meta * meta; + struct tpax_driver_ctx_impl ctx; + uint64_t guard; + const char * units[]; +}; + +static uint32_t tpax_argv_flags(uint32_t flags) +{ + uint32_t ret = ARGV_CLONE_VECTOR; + + if (flags & TPAX_DRIVER_VERBOSITY_NONE) + ret |= ARGV_VERBOSITY_NONE; + + if (flags & TPAX_DRIVER_VERBOSITY_ERRORS) + ret |= ARGV_VERBOSITY_ERRORS; + + if (flags & TPAX_DRIVER_VERBOSITY_STATUS) + ret |= ARGV_VERBOSITY_STATUS; + + return ret; +} + +static int tpax_driver_usage( + int fdout, + const char * program, + const char * arg, + const struct argv_option ** optv, + struct argv_meta * meta) +{ + char header[512]; + + snprintf(header,sizeof(header), + "Usage: %s [options] ...\n" "Options:\n", + program); + + argv_usage(fdout,header,optv,arg); + argv_free(meta); + + return TPAX_USAGE; +} + +static struct tpax_driver_ctx_impl * tpax_driver_ctx_alloc( + struct argv_meta * meta, + const struct tpax_fd_ctx * fdctx, + const struct tpax_common_ctx * cctx, + size_t nunits) +{ + struct tpax_driver_ctx_alloc * ictx; + size_t size; + struct argv_entry * entry; + const char ** units; + int elements; + + size = sizeof(struct tpax_driver_ctx_alloc); + size += (nunits+1)*sizeof(const char *); + + if (!(ictx = calloc(1,size))) + return 0; + + memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx)); + memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx)); + + elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf); + + ictx->ctx.errinfp = &ictx->ctx.erriptr[0]; + ictx->ctx.erricap = &ictx->ctx.erriptr[--elements]; + + ictx->meta = meta; + + for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++) + if (!entry->fopt) + *units++ = entry->arg; + + ictx->ctx.ctx.units = ictx->units; + ictx->ctx.ctx.errv = ictx->ctx.errinfp; + return &ictx->ctx; +} + +static int tpax_get_driver_ctx_fail(struct argv_meta * meta) +{ + argv_free(meta); + return -1; +} + +int tpax_get_driver_ctx( + char ** argv, + char ** envp, + uint32_t flags, + const struct tpax_fd_ctx * fdctx, + struct tpax_driver_ctx ** pctx) +{ + struct tpax_driver_ctx_impl * ctx; + struct tpax_common_ctx cctx; + const struct argv_option * optv[TPAX_OPTV_ELEMENTS]; + struct argv_meta * meta; + struct argv_entry * entry; + size_t nunits; + const char * program; + + (void)envp; + + if (!fdctx) + fdctx = &tpax_default_fdctx; + + argv_optv_init(tpax_default_options,optv); + + if (!(meta = argv_get( + argv,optv, + tpax_argv_flags(flags), + fdctx->fderr))) + return -1; + + nunits = 0; + program = argv_program_name(argv[0]); + memset(&cctx,0,sizeof(cctx)); + cctx.drvflags = flags; + + if (!argv[1] && (flags & TPAX_DRIVER_VERBOSITY_USAGE)) + return tpax_driver_usage( + fdctx->fderr, + program, + 0,optv,meta); + + /* get options, count units */ + for (entry=meta->entries; entry->fopt || entry->arg; entry++) { + if (entry->fopt) { + switch (entry->tag) { + case TAG_HELP: + if (flags & TPAX_DRIVER_VERBOSITY_USAGE) + return tpax_driver_usage( + fdctx->fdout, + program,entry->arg, + optv,meta); + break; + + case TAG_VERSION: + cctx.drvflags |= TPAX_DRIVER_VERSION; + break; + } + } else + nunits++; + } + + if (!(ctx = tpax_driver_ctx_alloc(meta,fdctx,&cctx,nunits))) + return tpax_get_driver_ctx_fail(meta); + + ctx->ctx.program = program; + ctx->ctx.cctx = &ctx->cctx; + + *pctx = &ctx->ctx; + return TPAX_OK; +} + +static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx) +{ + argv_free(ictx->meta); + free(ictx); +} + +void tpax_free_driver_ctx(struct tpax_driver_ctx * ctx) +{ + struct tpax_driver_ctx_alloc * ictx; + uintptr_t addr; + + if (ctx) { + addr = (uintptr_t)ctx - offsetof(struct tpax_driver_ctx_impl,ctx); + addr = addr - offsetof(struct tpax_driver_ctx_alloc,ctx); + ictx = (struct tpax_driver_ctx_alloc *)addr; + tpax_free_driver_ctx_impl(ictx); + } +} + +const struct tpax_source_version * tpax_source_version(void) +{ + return &tpax_src_version; +} + +int tpax_get_driver_fdctx( + const struct tpax_driver_ctx * dctx, + struct tpax_fd_ctx * fdctx) +{ + struct tpax_driver_ctx_impl * ictx; + + ictx = tpax_get_driver_ictx(dctx); + + fdctx->fdin = ictx->fdctx.fdin; + fdctx->fdout = ictx->fdctx.fdout; + fdctx->fderr = ictx->fdctx.fderr; + fdctx->fdlog = ictx->fdctx.fdlog; + fdctx->fdcwd = ictx->fdctx.fdcwd; + fdctx->fddst = ictx->fdctx.fddst; + + return 0; +} + +int tpax_set_driver_fdctx( + struct tpax_driver_ctx * dctx, + const struct tpax_fd_ctx * fdctx) +{ + struct tpax_driver_ctx_impl * ictx; + + ictx = tpax_get_driver_ictx(dctx); + + ictx->fdctx.fdin = fdctx->fdin; + ictx->fdctx.fdout = fdctx->fdout; + ictx->fdctx.fderr = fdctx->fderr; + ictx->fdctx.fdlog = fdctx->fdlog; + ictx->fdctx.fdcwd = fdctx->fdcwd; + ictx->fdctx.fddst = fdctx->fddst; + + return 0; +} -- cgit v1.2.3