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/*******************************************************************/
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/* slibtool: a skinny libtool implementation, written in C */
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/* Copyright (C) 2016--2017 Z. Gilboa */
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/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include "slibtool_errinfo_impl.h"
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#include "slibtool_symlink_impl.h"
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#define SLBT_DEV_NULL_FLAGS (SLBT_DRIVER_ALL_STATIC \
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| SLBT_DRIVER_DISABLE_SHARED \
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| SLBT_DRIVER_DISABLE_STATIC)
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int slbt_create_symlink(
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const struct slbt_driver_ctx * dctx,
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struct slbt_exec_ctx * ectx,
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const char * target,
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const char * lnkname,
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bool flawrapper)
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{
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char ** oargv;
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const char * slash;
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char * ln[5];
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char * dotdot;
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char tmplnk [PATH_MAX];
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char lnkarg [PATH_MAX];
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char atarget[PATH_MAX];
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/* atarget */
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if ((dctx->cctx->drvflags & SLBT_DEV_NULL_FLAGS)
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&& !strcmp(target,"/dev/null"))
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slash = target;
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else if ((slash = strrchr(target,'/')))
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slash++;
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else
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slash = target;
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dotdot = flawrapper ? "../" : "";
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if ((size_t)snprintf(atarget,sizeof(atarget),"%s%s",
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dotdot,slash) >= sizeof(atarget))
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return SLBT_BUFFER_ERROR(dctx);
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/* tmplnk */
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if ((size_t)snprintf(tmplnk,sizeof(tmplnk),"%s.symlink.tmp",
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lnkname) >= sizeof(tmplnk))
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return SLBT_BUFFER_ERROR(dctx);
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/* lnkarg */
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strcpy(lnkarg,lnkname);
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/* ln argv (fake) */
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ln[0] = "ln";
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ln[1] = "-s";
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ln[2] = atarget;
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ln[3] = lnkarg;
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ln[4] = 0;
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oargv = ectx->argv;
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ectx->argv = ln;
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/* step output */
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if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT)) {
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if (dctx->cctx->mode == SLBT_MODE_LINK) {
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if (slbt_output_link(dctx,ectx)) {
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ectx->argv = oargv;
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return SLBT_NESTED_ERROR(dctx);
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}
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} else {
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if (slbt_output_install(dctx,ectx)) {
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ectx->argv = oargv;
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return SLBT_NESTED_ERROR(dctx);
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}
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}
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}
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/* restore execution context */
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ectx->argv = oargv;
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/* create symlink */
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if (symlink(atarget,tmplnk))
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return SLBT_SYSTEM_ERROR(dctx);
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return rename(tmplnk,lnkname)
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? SLBT_SYSTEM_ERROR(dctx)
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: 0;
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}
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