Two cross-platform implementations of getline in C The 2019 Stack Overflow Developer Survey...
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Two cross-platform implementations of getline in C
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$begingroup$
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){
c=(char)fgetc(input_file);
if(c==EOF||c=='n')
break;
line[i]=c;
if(i==chunk_size*j){
++j;
char* tmp=realloc(line,chunk_size*(j+1)*sizeof*line+1);
if(tmp==NULL){
fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(j+1)*sizeof*line+1);
exit(1);
}else{
line=tmp;
memset(line+chunk_size*j,0,chunk_size);
}
}
}
if(strlen(line)==0){
free(line);
return NULL;
}else{
line[strlen(line)]=0;
return line;
}
}
c comparative-review file portability
edited 3 hours ago
200_success
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
$endgroup$
add a comment |
$begingroup$
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){
c=(char)fgetc(input_file);
if(c==EOF||c=='n')
break;
line[i]=c;
if(i==chunk_size*j){
++j;
char* tmp=realloc(line,chunk_size*(j+1)*sizeof*line+1);
if(tmp==NULL){
fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(j+1)*sizeof*line+1);
exit(1);
}else{
line=tmp;
memset(line+chunk_size*j,0,chunk_size);
}
}
}
if(strlen(line)==0){
free(line);
return NULL;
}else{
line[strlen(line)]=0;
return line;
}
}
c comparative-review file portability
edited 3 hours ago
200_success
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
$endgroup$
$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago
add a comment |
$begingroup$
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){
c=(char)fgetc(input_file);
if(c==EOF||c=='n')
break;
line[i]=c;
if(i==chunk_size*j){
++j;
char* tmp=realloc(line,chunk_size*(j+1)*sizeof*line+1);
if(tmp==NULL){
fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(j+1)*sizeof*line+1);
exit(1);
}else{
line=tmp;
memset(line+chunk_size*j,0,chunk_size);
}
}
}
if(strlen(line)==0){
free(line);
return NULL;
}else{
line[strlen(line)]=0;
return line;
}
}
c comparative-review file portability
edited 3 hours ago
200_success
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
$endgroup$
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){
c=(char)fgetc(input_file);
if(c==EOF||c=='n')
break;
line[i]=c;
if(i==chunk_size*j){
++j;
char* tmp=realloc(line,chunk_size*(j+1)*sizeof*line+1);
if(tmp==NULL){
fprintf(stderr,"Fatal: failed to allocate %zu bytes.n",chunk_size*(j+1)*sizeof*line+1);
exit(1);
}else{
line=tmp;
memset(line+chunk_size*j,0,chunk_size);
}
}
}
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
edited 3 hours ago
200_success
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
edited 3 hours ago
200_success
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
edited 3 hours ago
200_success
131k17157422
edited 3 hours ago
200_success
131k17157422
edited 3 hours ago
200_success
131k17157422
131k17157422
asked 5 hours ago
DeBos99DeBos99
917
asked 5 hours ago
DeBos99DeBos99
917
asked 5 hours ago
DeBos99DeBos99
917
917
$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago
add a comment |
$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago
$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago
$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago
add a comment |
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$begingroup$
Have you tested your code, and if so, how?
$endgroup$
– 200_success
3 hours ago