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/*******************************************************************/
/* slibtool: a strong libtool implementation, written in C */
/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <ctype.h>
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <slibtool/slibtool.h>
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
#include "slibtool_visibility_impl.h"
/********************************************************/
/* Read a text file, and create an in-memory vecotr of */
/* normalized text lines, stripped of both leading and */
/* trailing white space. */
/********************************************************/
static int slbt_lib_free_txtfile_ctx_impl(
struct slbt_txtfile_ctx_impl * ctx,
struct slbt_input * mapinfo,
int ret)
{
if (mapinfo)
slbt_fs_unmap_input(mapinfo);
if (ctx) {
if (ctx->pathbuf)
free(ctx->pathbuf);
if (ctx->txtlines)
free(ctx->txtlines);
if (ctx->txtlinev)
free(ctx->txtlinev);
free(ctx);
}
return ret;
}
static int slbt_lib_get_txtfile_ctx_impl(
const struct slbt_driver_ctx * dctx,
const char * path,
int fdsrc,
struct slbt_txtfile_ctx ** pctx)
{
struct slbt_txtfile_ctx_impl * ctx;
struct slbt_input mapinfo;
size_t nlines;
char * ch;
char * cap;
char * src;
char * mark;
const char ** pline;
char dummy;
int cint;
/* map txtfile file temporarily */
if (slbt_fs_map_input(dctx,fdsrc,path,PROT_READ,&mapinfo) < 0)
return SLBT_NESTED_ERROR(dctx);
/* alloc context */
if (!(ctx = calloc(1,sizeof(*ctx))))
return slbt_lib_free_txtfile_ctx_impl(
ctx,&mapinfo,
SLBT_BUFFER_ERROR(dctx));
/* count lines */
src = mapinfo.size ? mapinfo.addr : &dummy;
cap = &src[mapinfo.size];
for (; (src<cap) && isspace((cint=*src)); )
src++;
for (ch=src,nlines=0; ch<cap; ch++)
nlines += (*ch == '\n');
nlines += (ch[-1] != '\n');
/* clone path, alloc string buffer and line vector */
if (!(ctx->pathbuf = strdup(path)))
return slbt_lib_free_txtfile_ctx_impl(
ctx,&mapinfo,
SLBT_SYSTEM_ERROR(dctx,0));
if (!(ctx->txtlines = calloc(mapinfo.size+1,1)))
return slbt_lib_free_txtfile_ctx_impl(
ctx,&mapinfo,
SLBT_SYSTEM_ERROR(dctx,0));
if (!(ctx->txtlinev = calloc(nlines+1,sizeof(char *))))
return slbt_lib_free_txtfile_ctx_impl(
ctx,&mapinfo,
SLBT_SYSTEM_ERROR(dctx,0));
/* copy the source to the allocated string buffer */
memcpy(ctx->txtlines,mapinfo.addr,mapinfo.size);
slbt_fs_unmap_input(&mapinfo);
/* populate the line vector, handle whitespace */
src = ctx->txtlines;
cap = &src[mapinfo.size];
for (; (src<cap) && isspace((cint=*src)); )
*src++ = '\0';
for (ch=src,pline=ctx->txtlinev; ch<cap; pline++) {
for (; (ch<cap) && isspace((cint = *ch)); )
ch++;
if (ch < cap)
*pline = ch;
for (; (ch<cap) && (*ch != '\n'); )
ch++;
mark = ch;
for (--ch; (ch > *pline) && isspace((cint = *ch)); ch--)
*ch = '\0';
if ((ch = mark) < cap)
*ch++ = '\0';
}
/* all done */
ctx->dctx = dctx;
ctx->path = ctx->pathbuf;
ctx->tctx.path = &ctx->path;
ctx->tctx.txtlinev = ctx->txtlinev;
*pctx = &ctx->tctx;
return 0;
}
slbt_hidden int slbt_impl_get_txtfile_ctx(
const struct slbt_driver_ctx * dctx,
const char * path,
int fdsrc,
struct slbt_txtfile_ctx ** pctx)
{
return slbt_lib_get_txtfile_ctx_impl(dctx,path,fdsrc,pctx);
}
int slbt_lib_get_txtfile_ctx(
const struct slbt_driver_ctx * dctx,
const char * path,
struct slbt_txtfile_ctx ** pctx)
{
return slbt_lib_get_txtfile_ctx_impl(dctx,path,(-1),pctx);
}
void slbt_lib_free_txtfile_ctx(struct slbt_txtfile_ctx * ctx)
{
struct slbt_txtfile_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct slbt_txtfile_ctx_impl,tctx);
ictx = (struct slbt_txtfile_ctx_impl *)addr;
slbt_lib_free_txtfile_ctx_impl(ictx,0,0);
}
}
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