/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <slibtool/slibtool.h>
#include "slibtool_spawn_impl.h"
#include "slibtool_symlink_impl.h"
/*******************************************************************/
/* */
/* -o <ltlib> switches input result */
/* ---------- --------------------- ----- ------ */
/* libfoo.a [-shared|-static] bar.lo libfoo.a */
/* */
/* ar cru libfoo.a bar.o */
/* ranlib libfoo.a */
/* */
/*******************************************************************/
/*******************************************************************/
/* */
/* -o <ltlib> switches input result */
/* ---------- --------------------- ----- ------ */
/* libfoo.la -shared bar.lo libfoo.la */
/* .libs/libfoo.a */
/* .libs/libfoo.la (lnk) */
/* */
/* ar cru .libs/libfoo.a .libs/bar.o */
/* ranlib .libs/libfoo.a */
/* (generate libfoo.la) */
/* ln -s ../libfoo.la .libs/libfoo.la */
/* */
/*******************************************************************/
/*******************************************************************/
/* */
/* -o <ltlib> switches input result */
/* ---------- --------------------- ----- ------ */
/* libfoo.la -static bar.lo libfoo.la */
/* .libs/libfoo.a */
/* .libs/libfoo.la (lnk) */
/* */
/* ar cru .libs/libfoo.a bar.o */
/* ranlib .libs/libfoo.a */
/* (generate libfoo.la) */
/* ln -s ../libfoo.la .libs/libfoo.la */
/* */
/*******************************************************************/
static bool slbt_adjust_input_argument(
char * arg,
const char * osuffix,
const char * asuffix,
bool fpic)
{
char * slash;
char * dot;
char base[PATH_MAX];
if (*arg == '-')
return false;
if (!(dot = strrchr(arg,'.')))
return false;
if (strcmp(dot,osuffix))
return false;
if (fpic) {
if ((slash = strrchr(arg,'/')))
slash++;
else
slash = arg;
if ((size_t)snprintf(base,sizeof(base),"%s",
slash) >= sizeof(base))
return false;
sprintf(slash,".libs/%s",base);
dot = strrchr(arg,'.');
}
strcpy(dot,asuffix);
return true;
}
static bool slbt_adjust_linker_argument(
char * arg,
bool fpic,
const char * dsosuffix,
const char * arsuffix)
{
int fdlib;
char * slash;
char * dot;
char base[PATH_MAX];
if (*arg == '-')
return false;
if (!(dot = strrchr(arg,'.')))
return false;
if (strcmp(dot,".la"))
return false;
if (fpic) {
if ((slash = strrchr(arg,'/')))
slash++;
else
slash = arg;
if ((size_t)snprintf(base,sizeof(base),"%s",
slash) >= sizeof(base))
return false;
sprintf(slash,".libs/%s",base);
dot = strrchr(arg,'.');
}
/* shared library dependency? */
if (fpic) {
sprintf(dot,"%s",dsosuffix);
if ((fdlib = open(arg,O_RDONLY)) >= 0)
close(fdlib);
else
sprintf(dot,"%s",arsuffix);
return true;
}
/* input archive */
sprintf(dot,"%s",arsuffix);
return true;
}
static int slbt_exec_link_adjust_argument_vector(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * cwd,
bool flibrary)
{
char ** carg;
char ** aarg;
char * slash;
char * mark;
char * dot;
char arg[PATH_MAX];
bool fwholearchive = false;
carg = ectx->cargv;
aarg = ectx->altv;
for (; *carg; ) {
if (!strcmp(*carg,"-Wl,--whole-archive"))
fwholearchive = true;
else if (!strcmp(*carg,"-Wl,--no-whole-archive"))
fwholearchive = false;
if (**carg == '-') {
*aarg++ = *carg++;
} else if (!(dot = strrchr(*carg,'.'))) {
*aarg++ = *carg++;
} else if (!(strcmp(dot,".a"))) {
if (flibrary && !fwholearchive)
*aarg++ = "-Wl,--whole-archive";
*aarg++ = *carg++;
if (flibrary && !fwholearchive)
*aarg++ = "-Wl,--no-whole-archive";
} else if (strcmp(dot,dctx->cctx->settings.dsosuffix)) {
*aarg++ = *carg++;
} else if (carg == ectx->lout[1]) {
/* ^^^hoppla^^^ */
*aarg++ = *carg++;
} else {
/* account for {'-','L','-','l'} */
if ((size_t)snprintf(arg,sizeof(arg),"%s",
*carg) >= (sizeof(arg) - 4))
return -1;
if ((slash = strrchr(arg,'/'))) {
sprintf(*carg,"-L%s",arg);
mark = strrchr(*carg,'/');
*mark = '\0';
if (ectx->fwrapper) {
*slash = '\0';
if (fprintf(ectx->fwrapper,
"DL_PATH=\"$DL_PATH$COLON%s/%s\"\n"
"COLON=':'\n\n",
cwd,arg) < 0)
return -1;
}
*aarg++ = *carg++;
*aarg++ = ++mark;
++slash;
slash += strlen(dctx->cctx->settings.dsoprefix);
sprintf(mark,"-l%s",slash);
dot = strrchr(mark,'.');
*dot = '\0';
} else {
*aarg++ = *carg++;
}
}
}
return 0;
}
static int slbt_exec_link_remove_file(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * target)
{
/* remove target (if any) */
if (!(unlink(target)) || (errno == ENOENT))
return 0;
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
strerror(errno);
return -1;
}
static int slbt_exec_link_create_archive(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * arfilename,
bool fpic)
{
char ** aarg;
char ** parg;
char * ranlib[3];
char program[PATH_MAX];
char output [PATH_MAX];
/* initial state */
slbt_reset_arguments(ectx);
/* placeholders */
slbt_reset_placeholders(ectx);
/* alternate program (ar, ranlib) */
ectx->program = program;
/* output */
if ((size_t)snprintf(output,sizeof(output),"%s",
arfilename) >= sizeof(output))
return -1;
/* ar alternate argument vector */
if ((size_t)snprintf(program,sizeof(program),"%s",
dctx->cctx->host.ar) >= sizeof(program))
return -1;
aarg = ectx->altv;
*aarg++ = program;
*aarg++ = "cru";
*aarg++ = output;
/* input argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
if (slbt_adjust_input_argument(*parg,".lo",".o",fpic))
*aarg++ = *parg;
*aarg = 0;
ectx->argv = ectx->altv;
/* step output */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
if (slbt_output_link(dctx,ectx))
return -1;
/* remove old archive as needed */
if (slbt_exec_link_remove_file(dctx,ectx,output))
return -1;
/* ar spawn */
if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
return -1;
/* input objects associated with .la archives */
for (parg=ectx->cargv; *parg; parg++)
if (slbt_adjust_input_argument(*parg,".la",".a",fpic))
if (slbt_archive_import(dctx,ectx,output,*parg))
return -1;
/* ranlib argv */
if ((size_t)snprintf(program,sizeof(program),"%s",
dctx->cctx->host.ranlib) >= sizeof(program))
return -1;
ranlib[0] = program;
ranlib[1] = output;
ranlib[2] = 0;
ectx->argv = ranlib;
/* step output */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
if (slbt_output_link(dctx,ectx))
return -1;
/* ranlib spawn */
if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
return -1;
return 0;
}
static int slbt_exec_link_create_library(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * dsofilename)
{
char ** parg;
char cwd [PATH_MAX];
char output [PATH_MAX];
char soname [PATH_MAX];
/* initial state */
slbt_reset_arguments(ectx);
/* placeholders */
slbt_reset_placeholders(ectx);
/* input argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
slbt_adjust_input_argument(*parg,".lo",".o",true);
/* linker argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
slbt_adjust_linker_argument(
*parg,true,
dctx->cctx->settings.dsosuffix,
dctx->cctx->settings.arsuffix);
/* --no-undefined */
if (dctx->cctx->drvflags & SLBT_DRIVER_NO_UNDEFINED)
*ectx->noundef = "-Wl,--no-undefined";
/* -soname */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_AVOID_VERSION)) {
if ((size_t)snprintf(soname,sizeof(soname),"-Wl,%s%s%s.%d",
dctx->cctx->settings.dsoprefix,
dctx->cctx->libname,
dctx->cctx->settings.dsosuffix,
dctx->cctx->verinfo.major)
>= sizeof(soname))
return -1;
*ectx->soname = "-Wl,-soname";
*ectx->lsoname = soname;
}
/* shared object */
*ectx->dpic = "-shared";
*ectx->fpic = "-fPIC";
/* output */
if (dctx->cctx->drvflags & SLBT_DRIVER_AVOID_VERSION) {
strcpy(output,dsofilename);
} else {
if ((size_t)snprintf(output,sizeof(output),"%s.%d.%d.%d",
dsofilename,
dctx->cctx->verinfo.major,
dctx->cctx->verinfo.minor,
dctx->cctx->verinfo.revision)
>= sizeof(output))
return -1;
}
*ectx->lout[0] = "-o";
*ectx->lout[1] = output;
/* cwd */
if (!getcwd(cwd,sizeof(cwd)))
return -1;
/* .libs/libfoo.so --> -L.libs -lfoo */
if (slbt_exec_link_adjust_argument_vector(
dctx,ectx,cwd,true))
return -1;
/* using alternate argument vector */
ectx->argv = ectx->altv;
ectx->program = ectx->altv[0];
/* step output */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
if (slbt_output_link(dctx,ectx))
return -1;
/* spawn */
if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
return -1;
return 0;
}
static int slbt_exec_link_create_executable(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * exefilename)
{
char ** parg;
char cwd [PATH_MAX];
char output [PATH_MAX];
char wrapper[PATH_MAX];
char wraplnk[PATH_MAX];
/* initial state */
slbt_reset_arguments(ectx);
/* placeholders */
slbt_reset_placeholders(ectx);
/* input argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
slbt_adjust_input_argument(*parg,".lo",".o",true);
/* linker argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
slbt_adjust_linker_argument(
*parg,true,
dctx->cctx->settings.dsosuffix,
dctx->cctx->settings.arsuffix);
/* --no-undefined */
if (dctx->cctx->drvflags & SLBT_DRIVER_NO_UNDEFINED)
*ectx->noundef = "-Wl,--no-undefined";
/* executable wrapper: header */
if ((size_t)snprintf(wrapper,sizeof(wrapper),"%s.wrapper.tmp",
dctx->cctx->output)
>= sizeof(wrapper))
return -1;
if (!(ectx->fwrapper = fopen(wrapper,"w")))
return -1;
if (fprintf(ectx->fwrapper,
"#!/bin/sh\n"
"# slibtool (pre-alpha): generated executable wrapper\n\n"
"if [ -z \"$%s\" ]; then\n"
"\tDL_PATH=\n"
"\tCOLON=\n"
"\tLCOLON=\n"
"else\n"
"\tDL_PATH=\n"
"\tCOLON=\n"
"\tLCOLON=':'\n"
"fi\n\n",
dctx->cctx->settings.ldpathenv) < 0)
return -1;
/* output */
if ((size_t)snprintf(output,sizeof(output),"%s",
exefilename)
>= sizeof(output))
return -1;
*ectx->lout[0] = "-o";
*ectx->lout[1] = output;
/* cwd */
if (!getcwd(cwd,sizeof(cwd)))
return -1;
/* .libs/libfoo.so --> -L.libs -lfoo */
if (slbt_exec_link_adjust_argument_vector(
dctx,ectx,cwd,false))
return -1;
/* using alternate argument vector */
ectx->argv = ectx->altv;
ectx->program = ectx->altv[0];
/* executable wrapper: footer */
if (fprintf(ectx->fwrapper,
"DL_PATH=\"$DL_PATH$LCOLON$%s\"\n\n"
"export %s=$DL_PATH\n\n"
"exec %s/%s \"$@\"\n",
dctx->cctx->settings.ldpathenv,
dctx->cctx->settings.ldpathenv,
cwd,exefilename) < 0)
return -1;
/* step output */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
if (slbt_output_link(dctx,ectx))
return -1;
/* spawn */
if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
return -1;
/* executable wrapper: finalize */
fclose(ectx->fwrapper);
ectx->fwrapper = 0;
if ((size_t)snprintf(wraplnk,sizeof(wraplnk),"%s.exe.wrapper",
dctx->cctx->output) >= sizeof(wraplnk))
return -1;
if (slbt_create_symlink(
dctx,ectx,
dctx->cctx->output,wraplnk,
false))
return -1;
if (rename(wrapper,dctx->cctx->output))
return -1;
if (chmod(dctx->cctx->output,0755))
return -1;
return 0;
}
static int slbt_exec_link_create_library_symlink(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
bool fmajor)
{
char target[PATH_MAX];
char lnkname[PATH_MAX];
sprintf(target,"%s.%d.%d.%d",
ectx->dsofilename,
dctx->cctx->verinfo.major,
dctx->cctx->verinfo.minor,
dctx->cctx->verinfo.revision);
if (fmajor)
sprintf(lnkname,"%s.%d",
ectx->dsofilename,
dctx->cctx->verinfo.major);
else
strcpy(lnkname,ectx->dsofilename);
return slbt_create_symlink(
dctx,ectx,
target,lnkname,
false);
}
int slbt_exec_link(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx)
{
int ret;
int fdlibs;
const char * output;
char * dot;
FILE * fout;
struct slbt_exec_ctx * actx;
/* context */
if (ectx)
actx = 0;
else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))
return ret;
else
actx = ectx;
/* output suffix */
output = dctx->cctx->output;
dot = strrchr(output,'.');
/* .libs directory */
if (dctx->cctx->drvflags & SLBT_DRIVER_SHARED) {
if ((fdlibs = open(ectx->ldirname,O_DIRECTORY)) >= 0)
close(fdlibs);
else if ((errno != ENOENT) || mkdir(ectx->ldirname,0777)) {
slbt_free_exec_ctx(actx);
return -1;
}
}
/* non-pic libfoo.a */
if (dot && !strcmp(dot,".a"))
if (slbt_exec_link_create_archive(dctx,ectx,output,false)) {
slbt_free_exec_ctx(actx);
return -1;
}
/* pic libfoo.a */
if (dot && !strcmp(dot,".la"))
if (slbt_exec_link_create_archive(
dctx,ectx,
ectx->arfilename,
dctx->cctx->drvflags & SLBT_DRIVER_SHARED)) {
slbt_free_exec_ctx(actx);
return -1;
}
/* dynamic library */
if (dot && !strcmp(dot,".la") && dctx->cctx->rpath) {
/* linking: libfoo.so.x.y.z */
if (slbt_exec_link_create_library(
dctx,ectx,
ectx->dsofilename)) {
slbt_free_exec_ctx(actx);
return -1;
}
if (!(dctx->cctx->drvflags & SLBT_DRIVER_AVOID_VERSION)) {
/* symlink: libfoo.so.x --> libfoo.so.x.y.z */
if (slbt_exec_link_create_library_symlink(
dctx,ectx,
true)) {
slbt_free_exec_ctx(actx);
return -1;
}
/* symlink: libfoo.so --> libfoo.so.x.y.z */
if (slbt_exec_link_create_library_symlink(
dctx,ectx,
false)) {
slbt_free_exec_ctx(actx);
return -1;
}
}
}
/* executable */
if (!dctx->cctx->rpath && !dctx->cctx->libname) {
/* linking: .libs/exefilename */
if (slbt_exec_link_create_executable(
dctx,ectx,
ectx->exefilename)) {
slbt_free_exec_ctx(actx);
return -1;
}
}
/* no wrapper? */
if (!dot || strcmp(dot,".la")) {
slbt_free_exec_ctx(actx);
return 0;
}
/* hey, yo, let's rap it up */
if (!(fout = fopen(output,"w"))) {
slbt_free_exec_ctx(actx);
return -1;
}
/* wrapper symlink */
if (slbt_create_symlink(
dctx,ectx,
output,
ectx->lafilename,
true))
ret = -1;
else
ret = fprintf(fout,
"# slibtool (pre-alpha) generated file\n\n");
/* all done */
fclose(fout);
slbt_free_exec_ctx(actx);
return (ret > 0) ? 0 : -1;
}