utils/preprocess.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 19 Feb 2009 01:46:18 -0500
changeset 661 a502c4999238
parent 660 d82a22c8ab3d
child 662 50ff6f3eaa4f
permissions -rw-r--r--
Fixed logic bug: used wrong variable.
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/**
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 * MojoShader; generate shader programs from bytecode of compiled
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 *  Direct3D shaders.
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mojoshader.h"
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static const char **include_paths = NULL;
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static unsigned int include_path_count = 0;
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static int open_include(MOJOSHADER_includeType inctype, const char *fname,
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                        const char *parent, const char **outdata,
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                        unsigned int *outbytes, MOJOSHADER_malloc m,
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                        MOJOSHADER_free f, void *d)
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{
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    int i;
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    for (i = 0; i < include_path_count; i++)
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    {
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        const char *path = include_paths[i];
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        const size_t len = strlen(path) + strlen(fname) + 2;
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        char *buf = (char *) m(len, d);
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        if (buf == NULL)
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            return 0;
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        snprintf(buf, len, "%s/%s", path, fname);
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        FILE *io = fopen(buf, "rb");
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        f(buf, d);
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        if (io == NULL)
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            continue;
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        if (fseek(io, 0, SEEK_END) != -1)
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        {
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            const long fsize = ftell(io);
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            if ((fsize == -1) || (fseek(io, 0, SEEK_SET) == -1))
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            {
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                fclose(io);
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                return 0;
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            } // if
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            char *data = (char *) m(fsize, d);
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            if (data == NULL)
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            {
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                fclose(io);
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                return 0;
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            } // if
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            if (fread(data, fsize, 1, io) != 1)
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            {
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                f(data, d);
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                fclose(io);
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                return 0;
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            } // if
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            fclose(io);
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            *outdata = data;
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            *outbytes = (unsigned int) fsize;
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            return 1;
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        } // if
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    } // for
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    return 0;
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} // open_include
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void close_include(const char *data, MOJOSHADER_malloc m,
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                   MOJOSHADER_free f, void *d)
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{
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    f((void *) data, d);
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} // close_include
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static int preprocess(const char *fname, const char *buf, int len,
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                      const char *outfile,
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                      const MOJOSHADER_preprocessorDefine *defs,
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                      unsigned int defcount)
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{
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    FILE *io = outfile ? fopen(outfile, "wb") : stdout;
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    if (io == NULL)
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    {
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        printf(" ... fopen('%s') failed.\n", outfile);
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        return 0;
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    } // if
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    const MOJOSHADER_preprocessData *pd;
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    int retval = 0;
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    pd = MOJOSHADER_preprocess(fname, buf, len, defs, defcount,
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                               open_include, close_include, NULL, NULL, NULL);
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    if (pd->error_count > 0)
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    {
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        int i;
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        for (i = 0; i < pd->error_count; i++)
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        {
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            printf("%s:%d: ERROR: %s\n",
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                    pd->errors[i].filename ? pd->errors[i].filename : "???",
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                    pd->errors[i].error_position,
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                    pd->errors[i].error);
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        } // for
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    } // if
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    else
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    {
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        if (pd->output != NULL)
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        {
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            if (fwrite(pd->output, pd->output_len, 1, io) != 1)
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                printf(" ... fwrite('%s') failed.\n", outfile);
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            else if ((outfile != NULL) && (fclose(io) == EOF))
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                printf(" ... fclose('%s') failed.\n", outfile);
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            else
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                retval = 1;
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        } // if
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    } // else
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    MOJOSHADER_freePreprocessData(pd);
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    return retval;
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} // preprocess
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int main(int argc, char **argv)
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{
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    int retval = 1;
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    const char *infile = NULL;
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    const char *outfile = NULL;
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    int i;
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    MOJOSHADER_preprocessorDefine *defs = NULL;
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    unsigned int defcount = 0;
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    for (i = 1; i < argc; i++)
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    {
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        const char *arg = argv[i];
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        if (strcmp(arg, "-o") == 0)
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        {
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            if (outfile != NULL)
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            {
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                printf("multiple output files specified.\n");
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                exit(1);
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            } // if
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            arg = argv[++i];
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            if (arg == NULL)
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            {
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                printf("no filename after '-o'\n");
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                exit(1);
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            } // if
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            outfile = arg;
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        } // if
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        if (strcmp(arg, "-I") == 0)
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        {
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            arg = argv[++i];
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            if (arg == NULL)
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            {
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                printf("no path after '-I'\n");
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                exit(1);
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            } // if
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            include_paths = (const char **) realloc(include_paths,
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                       (include_path_count+1) * sizeof (char *));
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            include_paths[include_path_count] = arg;
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            include_path_count++;
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        } // if
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        else if (strncmp(arg, "-D", 2) == 0)
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        {
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            arg += 2;
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            char *ident = strdup(arg);
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            char *ptr = strchr(ident, '=');
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            const char *val = "";
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            if (ptr)
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            {
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                *ptr = '\0';
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                val = ptr+1;
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            } // if
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            defs = (MOJOSHADER_preprocessorDefine *) realloc(defs,
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                       (defcount+1) * sizeof (MOJOSHADER_preprocessorDefine));
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            defs[defcount].identifier = ident;
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            defs[defcount].definition = val;
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            defcount++;
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        } // else if
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        else
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        {
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            if (infile != NULL)
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            {
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                printf("multiple input files specified.\n");
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                exit(1);
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            } // if
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            infile = arg;
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        } // else
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    } // for
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    if (infile == NULL)
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    {
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        printf("no input file specified.\n");
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        exit(1);
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    } // if
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    FILE *io = fopen(infile, "rb");
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    if (io == NULL)
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        printf(" ... fopen('%s') failed.\n", infile);
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    else
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    {
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        char *buf = (char *) malloc(1000000);
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        int rc = fread(buf, 1, 1000000, io);
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        fclose(io);
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        if (rc == EOF)
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            printf(" ... fread('%s') failed.\n", infile);
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        else
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        {
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            if (preprocess(infile, buf, rc, outfile, defs, defcount))
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                retval = 0;
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            else
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            {
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                if (outfile != NULL)
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                    remove(outfile);
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            } // else
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            free(buf);
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        } // else
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    } // else
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    for (i = 0; i < defcount; i++)
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        free((void *) defs[i].identifier);
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    free(defs);
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    free(include_paths);
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    return retval;
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} // main
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// end of preprocess.c ...
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