与野牛

Question

挣扎。这是我尝试解析我的输入文件：

Sphere(worldGlobe). 
Texture(worldGlobe, worldGlobeTexture1). 
Clouds(clouds1). 

我得到一个分段错误这样。出于某种原因，如果我只是切换这些句子的顺序，一切正常。

Sphere(worldGlobe). 
Clouds(clouds1). 
Texture(worldGlobe, worldGlobeTexture1). 

str_multicat只是连接更多的字符串。语法很简单。如果我删除从最后的模式这段代码为“谓：”我没有得到细分误差：

char result[1000]; 
str_multicat(result, 
"file -import \"D:/Program Files/Autodesk/Maya2012/presets/fluids/examples  /CloudsAndFog/FasterClouds.ma\";\n", 
"rename cloudLayer ", cloudLayer, ";\n", 
"rename skyFog ", skyFog, ";\n"); 

这是我的野牛文件。

%{ 
#include <math.h> 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <stdarg.h> 

int yylex(void); 
void yyerror(char*); 

void str_multicat(char* result, ...); 
%} 

%union { 
    char* s; 
    double d; 
    int i; 
} 

/* Tokens */ 
%token SPHERE 
%token TEXTURE 
%token CLOUDS 
%token CLOUDS_TRANSPARENCY 
%token ROTATE 
%token TRANSLATEIN 
%token CAMERA 
%token CAMERASHOT 

%token LBRACKET 
%token RBRACKET 
%token DOT 
%token COMMA 

%token <d> DOUBLE 
%token <i> INT; 
%token <s> NAME 

%% 

listOfPredicates: /* empty string */ 
     | predicate listOfPredicates 
; 

predicate: 
SPHERE LBRACKET NAME RBRACKET DOT 
{ 
    char result[1000]; 
    strcpy(result, "polySphere -n "); 
    strcat(result, $3); 
    strcat(result, ";\n\0");   

    printf("%s\n", result); 
} 
| 
TEXTURE LBRACKET NAME COMMA NAME RBRACKET DOT 
{  
    char object[50]; 
    strcpy(object, $3); 

    char material[50]; 
    strcpy(material, object); 
    strcat(material, "Mat"); 

    char materialSG[50]; 
    strcpy(materialSG, material); 
    strcat(materialSG, "SG"); 

    char texture[50]; 
    strcpy(texture, $5); 

    char objectPlace2dTexture[50]; 
    strcpy(objectPlace2dTexture, object); 
    strcat(objectPlace2dTexture, "_place2dTexture"); 

    char objectFile[50]; 
    strcpy(objectFile, object); 
    strcat(objectFile, "_file"); 

    char result[10000]; 
    str_multicat(result, 
    "// Assign new material\n", 
    "shadingNode -asShader lambert -n ", material, ";\n", 
    "sets -renderable true -noSurfaceShader true -empty -name ", materialSG, ";\n", 
    "connectAttr -f ", material, ".outColor ", materialSG, ".surfaceShader;\n", 
    "assignCreatedShader \"lambert\" \"\" ", material, " \"", object, "\";\n", 
    "sets -e -forceElement ", materialSG, ";\n", 
    "// Create file and place2dTexture nodes and connect them\n", 
    "shadingNode -asTexture file -n ", objectFile, ";\n", 
    "shadingNode -asUtility place2dTexture -n ", objectPlace2dTexture, ";\n", 
    "connectAttr -f ", objectPlace2dTexture, ".coverage ", objectFile, ".coverage;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".translateFrame ", objectFile,   ".translateFrame;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".rotateFrame ", objectFile, ".rotateFrame;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".mirrorU ", objectFile, ".mirrorU;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".mirrorV ", objectFile, ".mirrorV;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".stagger ", objectFile, ".stagger;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".wrapU ", objectFile, ".wrapU;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".wrapV ", objectFile, ".wrapV;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".repeatUV ", objectFile, ".repeatUV;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".offset ", objectFile, ".offset;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".rotateUV ", objectFile, ".rotateUV;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".noiseUV ", objectFile, ".noiseUV;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".vertexUvOne ", objectFile, ".vertexUvOne;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".vertexUvTwo ", objectFile, ".vertexUvTwo;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".vertexUvThree ", objectFile, ".vertexUvThree;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".vertexCameraOne ", objectFile, ".vertexCameraOne;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".outUV ", objectFile, ".uv;\n", 
    "connectAttr -f ", objectPlace2dTexture, ".outUvFilterSize ", objectFile, ".uvFilterSize;\n", 
    "connectAttr -force ", objectFile, ".outColor ", material, ".color;\n", 
    "// Finally assign the texture file\n", 
    "setAttr -type \"string\" ", objectFile, ".fileTextureName \"C:/Maya/Textures/", texture, ".jpg\";\n" 
    ); 

    printf("%s\n", result); 
} 
| 

CLOUDS LBRACKET NAME RBRACKET DOT 

{ 
    char cloudsName[50]; 
    strcpy(cloudsName, $3); 


    char cloudLayer[50]; 
    strcpy(cloudLayer, cloudsName); 
    strcat(cloudLayer, "_cloudLayer"); 

    char skyFog[50]; 
    strcpy(skyFog, cloudsName); 

strcat(skyFog, "_skyFog"); 

    char result[1000]; 
    str_multicat(result, 
"file -import \"D:/Program Files/Autodesk/Maya2012/presets/fluids/examples /CloudsAndFog/FasterClouds.ma\";\n", 
    "rename cloudLayer ", cloudLayer, ";\n", 
    "rename skyFog ", skyFog, ";\n"); 


    printf("%s\n", result); 

} 
; 

%% 

main() { 
    yyparse(); 
} 

void yyerror(char *s) { 
    fprintf(stderr, "ERROR: %s\n", s); 
} 

void str_multicat(char* result, ...) 
{ 
    // Init arguments list 
    va_list argptr; 
    va_start(argptr, result); 

    // Use arguments 
    char* val;    
     strcpy(result, va_arg(argptr, char*)); 
    while(val = va_arg(argptr, char*)) 
    {  
       strcat(result, val); 
    } 
    strcat(result, "\0"); 

    // End arguments list 
    va_end(argptr); 
} 

Answer 1

（问题回答在评论见Question with no answers, but issue solved in the comments (or extended in chat)）

@larsman写道：

Your str_multicat should receive a final NULL argument in every call.