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/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <slibtool/slibtool.h>
#define SLBT_ARGV_SPARE_PTRS 16
struct slbt_exec_ctx_impl {
int argc;
char * args;
struct slbt_exec_ctx ctx;
char * buffer[];
};
static size_t slbt_parse_comma_separated_flags(
const char * str,
int * argc)
{
const char * ch;
for (ch=str; *ch; ch++)
if (*ch == ',')
(*argc)++;
return ch - str;
}
static char * slbt_source_file(char ** argv)
{
char ** parg;
char * ch;
for (parg=argv; *parg; parg++)
if ((ch = strrchr(*parg,'.')))
if ((!(strcmp(++ch,"s")))
|| (!(strcmp(ch,"S")))
|| (!(strcmp(ch,"c")))
|| (!(strcmp(ch,"cc")))
|| (!(strcmp(ch,"cxx"))))
return *parg;
return 0;
}
static struct slbt_exec_ctx_impl * slbt_exec_ctx_alloc(
const struct slbt_driver_ctx * dctx)
{
struct slbt_exec_ctx_impl * ictx;
size_t size;
int argc;
char * args;
char * csrc;
char ** parg;
argc = 0;
csrc = 0;
/* clerical [worst-case] buffer size (guard, .libs, version) */
size = strlen(".lo") + sizeof('\0');
size += 8 * (strlen(".libs/") + sizeof('\0'));
size += 36 * (strlen(".0000") + sizeof('\0'));
/* buffer size (cargv, -Wc) */
for (parg=dctx->cctx->cargv; *parg; parg++, argc++)
if (!(strncmp("-Wc,",*parg,4)))
size += sizeof('\0') + slbt_parse_comma_separated_flags(
&(*parg)[4],&argc);
else
size += sizeof('\0') + strlen(*parg);
/* buffer size (ldirname, lbasename, lobjname, aobjname, ltobjname) */
if (dctx->cctx->output)
size += 4*strlen(dctx->cctx->output);
else if ((csrc = slbt_source_file(dctx->cctx->cargv)))
size += 4*strlen(csrc);
/* buffer size (.libs/%.o, pessimistic) */
size += argc * strlen(".libs/");
/* buffer size (linking) */
if (dctx->cctx->mode == SLBT_MODE_LINK)
size += strlen(dctx->cctx->settings.arprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.arsuffix) + sizeof('\0')
+ strlen(dctx->cctx->settings.dsoprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.dsoprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.exeprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.exeprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.impprefix) + sizeof('\0')
+ strlen(dctx->cctx->settings.impprefix) + sizeof('\0');
/* alloc */
if (!(args = malloc(size)))
return 0;
size = sizeof(*ictx) + (argc+SLBT_ARGV_SPARE_PTRS)*sizeof(char *);
if (!(ictx = calloc(1,size))) {
free(args);
return 0;
}
ictx->args = args;
ictx->argc = argc;
ictx->ctx.csrc = csrc;
return ictx;
}
int slbt_get_exec_ctx(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx ** ectx)
{
struct slbt_exec_ctx_impl * ictx;
char ** parg;
char * ch;
char * mark;
const char * ref;
int i;
/* alloc */
if (!(ictx = slbt_exec_ctx_alloc(dctx)))
return -1;
/* init with guard for later .lo check */
ch = ictx->args + strlen(".lo");
ictx->ctx.argv = ictx->buffer;
/* <compiler> */
ictx->ctx.program = dctx->cctx->cargv[0];
/* ldirname, lbasename */
ref = (dctx->cctx->output)
? dctx->cctx->output
: ictx->ctx.csrc;
if (ref && !ictx->ctx.csrc && (mark = strrchr(ref,'/'))) {
ictx->ctx.ldirname = ch;
strcpy(ch,ref);
ch += mark - ref;
ch += sprintf(ch,"%s","/.libs/");
ch++;
ictx->ctx.lbasename = ch;
ch += sprintf(ch,"%s",++mark);
ch++;
} else if (ref) {
ictx->ctx.ldirname = ch;
ch += sprintf(ch,"%s",".libs/");
ch++;
ictx->ctx.lbasename = ch;
mark = strrchr(ref,'/');
ch += sprintf(ch,"%s",mark ? ++mark : ref);
ch++;
}
/* lbasename suffix */
if (ref && (dctx->cctx->mode == SLBT_MODE_COMPILE)) {
if ((ch[-4] == '.') && (ch[-3] == 'l') && (ch[-2] == 'o')) {
ch[-3] = 'o';
ch[-2] = '\0';
ch--;
} else if (ictx->ctx.csrc) {
if ((mark = strrchr(ictx->ctx.lbasename,'.'))) {
ch = mark;
*++ch = 'o';
*++ch = '\0';
ch++;
}
}
}
/* cargv, -Wc */
for (i=0, parg=dctx->cctx->cargv; *parg; parg++, ch++) {
if (!(strncmp("-Wc,",*parg,4))) {
strcpy(ch,&(*parg)[4]);
ictx->ctx.argv[i++] = ch;
for (; *ch; ch++)
if (*ch == ',') {
*ch++ = '\0';
ictx->ctx.argv[i++] = ch;
}
} else {
ictx->ctx.argv[i++] = ch;
ch += sprintf(ch,"%s",*parg);
}
}
/* placeholders for -DPIC, -fPIC, -c, -o, <output> */
ictx->ctx.dpic = &ictx->ctx.argv[i++];
ictx->ctx.fpic = &ictx->ctx.argv[i++];
ictx->ctx.cass = &ictx->ctx.argv[i++];
ictx->ctx.lout[0] = &ictx->ctx.argv[i++];
ictx->ctx.lout[1] = &ictx->ctx.argv[i++];
/* output file name */
if (ref && ((dctx->cctx->mode == SLBT_MODE_COMPILE))) {
*ictx->ctx.lout[0] = "-o";
*ictx->ctx.lout[1] = ch;
ictx->ctx.lobjname = ch;
ch += sprintf(ch,"%s%s",
ictx->ctx.ldirname,
ictx->ctx.lbasename)
+ sizeof('\0');
ictx->ctx.aobjname = ch;
ch += sprintf(ch,"%s",ictx->ctx.ldirname);
ch -= strlen(".libs/");
ch += sprintf(ch,"%s",
ictx->ctx.lbasename)
+ sizeof('\0');
ictx->ctx.ltobjname = ch;
strcpy(ch,ictx->ctx.aobjname);
if ((mark = strrchr(ch,'.')))
ch = mark + sprintf(mark,"%s",".lo")
+ sizeof('\0');
}
*ectx = &ictx->ctx;
return 0;
}
static int slbt_free_exec_ctx_impl(
struct slbt_exec_ctx_impl * ictx,
int status)
{
free(ictx->args);
free (ictx);
return status;
}
void slbt_free_exec_ctx(struct slbt_exec_ctx * ctx)
{
struct slbt_exec_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct slbt_exec_ctx_impl,ctx);
ictx = (struct slbt_exec_ctx_impl *)addr;
slbt_free_exec_ctx_impl(ictx,0);
}
}
void slbt_reset_placeholders(struct slbt_exec_ctx * ectx)
{
*ectx->dpic = "-USLIBTOOL_PLACEHOLDER_DPIC";
*ectx->fpic = "-USLIBTOOL_PLACEHOLDER_FPIC";
*ectx->cass = "-USLIBTOOL_PLACEHOLDER_COMPILE_ASSEMBLE";
*ectx->lout[0] = "-USLIBTOOL_PLACEHOLDER_OUTPUT_SWITCH";
*ectx->lout[1] = "-USLIBTOOL_PLACEHOLDER_OUTPUT_FILE";
}
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