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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 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 ** parg;
size = argc = 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);
/* alloc */
if (!(args = malloc(size + strlen(".libs/")
+ strlen(".lo")
+ strlen(dctx->cctx->output))))
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;
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 * slash;
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];
/* 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+1;
}
} else {
ictx->ctx.argv[i++] = ch;
ch += sprintf(ch,"%s",*parg);
}
}
if (dctx->cctx->mode == SLBT_MODE_COMPILE) {
if (dctx->cctx->drvflags & SLBT_DRIVER_SHARED) {
ictx->ctx.argv[i++] = "-DPIC";
ictx->ctx.argv[i++] = "-fPIC";
}
ictx->ctx.argv[i++] = "-c";
ictx->ctx.argv[i++] = "-o";
ictx->ctx.argv[i++] = ch;
if ((slash = strrchr(dctx->cctx->output,'/'))) {
sprintf(ch,"%s",dctx->cctx->output);
ch += slash - dctx->cctx->output;
ch += sprintf(ch,"/.libs%s",slash);
} else
ch += sprintf(ch,".libs/%s",dctx->cctx->output);
if ((ch[-3] == '.') && (ch[-2] == 'l') && (ch[-1] == 'o')) {
ch[-2] = 'o';
ch[-1] = '\0';
ch--;
}
}
*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);
}
}
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