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Two cross-platform implementations of getline in C



The 2019 Stack Overflow Developer Survey Results Are InC getline functionJavaScript parallax cross-platform efficiencyTwo implementations of website internationalizationTwo implementations of file-readingLongest string in a vector — two implementationsCross-platform performance and statistical information scriptANSI colors cross platformCross-platform file hash sum generator in PythonPlatform-agnostic windowing libraryA portable cross platform C++17 method to retrieve the current date and time



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1












$begingroup$


I created my cross-platform implementations of getline function in C.



It takes different arguments and have different return values than 'original' getline function, but aim is the same. The only argument input_file is file from which the line have to be read. Return value is the line read from file or NULL if nothing read.



Here is one implementation, using fgets():



static inline char*
read_next_line(FILE* input_file)
 const unsigned int chunk_size=256;
 char* line=malloc(chunk_size*sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 unsigned int i;
 for(i=0;;++i)
 memset(line+chunk_size*i,0,chunk_size);
 if(fgets(line+chunk_size*i,chunk_size+1,input_file)==NULL)
 break;
 if(line[strlen(line)-1]=='n')
 break;
 char* tmp=realloc(line,chunk_size*(i+2)*sizeof*line+1);
 if(tmp==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(i+2)*sizeof*line+1);
 exit(1);
 else
 line=tmp;
 
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)-1]=0;
 return line;



Here is my second implementation, using fgetc():



static inline char*
getline(FILE* input_file)
 const unsigned int chunk_size=3;
 char* line=calloc(chunk_size,sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 char c;
 unsigned int i,j;
 for(i=0,j=1;;++i)
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)]=0;
 return line;






c comparative-review file portability







share|improve this question











$endgroup$











  • $begingroup$
    Have you tested your code, and if so, how?
    $endgroup$
    – 200_success
    9 mins ago

















1












$begingroup$


I created my cross-platform implementations of getline function in C.



It takes different arguments and have different return values than 'original' getline function, but aim is the same. The only argument input_file is file from which the line have to be read. Return value is the line read from file or NULL if nothing read.



Here is one implementation, using fgets():



static inline char*
read_next_line(FILE* input_file)
 const unsigned int chunk_size=256;
 char* line=malloc(chunk_size*sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 unsigned int i;
 for(i=0;;++i)
 memset(line+chunk_size*i,0,chunk_size);
 if(fgets(line+chunk_size*i,chunk_size+1,input_file)==NULL)
 break;
 if(line[strlen(line)-1]=='n')
 break;
 char* tmp=realloc(line,chunk_size*(i+2)*sizeof*line+1);
 if(tmp==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(i+2)*sizeof*line+1);
 exit(1);
 else
 line=tmp;
 
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)-1]=0;
 return line;



Here is my second implementation, using fgetc():



static inline char*
getline(FILE* input_file)
 const unsigned int chunk_size=3;
 char* line=calloc(chunk_size,sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 char c;
 unsigned int i,j;
 for(i=0,j=1;;++i)
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)]=0;
 return line;






c comparative-review file portability







share|improve this question











$endgroup$











  • $begingroup$
    Have you tested your code, and if so, how?
    $endgroup$
    – 200_success
    9 mins ago













1












1








1





$begingroup$


I created my cross-platform implementations of getline function in C.



It takes different arguments and have different return values than 'original' getline function, but aim is the same. The only argument input_file is file from which the line have to be read. Return value is the line read from file or NULL if nothing read.



Here is one implementation, using fgets():



static inline char*
read_next_line(FILE* input_file)
 const unsigned int chunk_size=256;
 char* line=malloc(chunk_size*sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 unsigned int i;
 for(i=0;;++i)
 memset(line+chunk_size*i,0,chunk_size);
 if(fgets(line+chunk_size*i,chunk_size+1,input_file)==NULL)
 break;
 if(line[strlen(line)-1]=='n')
 break;
 char* tmp=realloc(line,chunk_size*(i+2)*sizeof*line+1);
 if(tmp==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(i+2)*sizeof*line+1);
 exit(1);
 else
 line=tmp;
 
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)-1]=0;
 return line;



Here is my second implementation, using fgetc():



static inline char*
getline(FILE* input_file)
 const unsigned int chunk_size=3;
 char* line=calloc(chunk_size,sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 char c;
 unsigned int i,j;
 for(i=0,j=1;;++i)
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)]=0;
 return line;






c comparative-review file portability







share|improve this question











$endgroup$




I created my cross-platform implementations of getline function in C.



It takes different arguments and have different return values than 'original' getline function, but aim is the same. The only argument input_file is file from which the line have to be read. Return value is the line read from file or NULL if nothing read.



Here is one implementation, using fgets():



static inline char*
read_next_line(FILE* input_file)
 const unsigned int chunk_size=256;
 char* line=malloc(chunk_size*sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 unsigned int i;
 for(i=0;;++i)
 memset(line+chunk_size*i,0,chunk_size);
 if(fgets(line+chunk_size*i,chunk_size+1,input_file)==NULL)
 break;
 if(line[strlen(line)-1]=='n')
 break;
 char* tmp=realloc(line,chunk_size*(i+2)*sizeof*line+1);
 if(tmp==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(i+2)*sizeof*line+1);
 exit(1);
 else
 line=tmp;
 
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)-1]=0;
 return line;



Here is my second implementation, using fgetc():



static inline char*
getline(FILE* input_file)
 const unsigned int chunk_size=3;
 char* line=calloc(chunk_size,sizeof*line+1);
 if(line==NULL)
 fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*sizeof*line+1);
 exit(1);
 
 char c;
 unsigned int i,j;
 for(i=0,j=1;;++i)
 if(strlen(line)==0)
 free(line);
 return NULL;
 else
 line[strlen(line)]=0;
 return line;






c comparative-review file portability




c comparative-review file portability






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 11 mins ago









200_success

131k17157422




131k17157422










asked 2 hours ago









DeBos99DeBos99

867




867











  • $begingroup$
    Have you tested your code, and if so, how?
    $endgroup$
    – 200_success
    9 mins ago
















  • $begingroup$
    Have you tested your code, and if so, how?
    $endgroup$
    – 200_success
    9 mins ago















$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
9 mins ago




$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
9 mins ago










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