c - How to parse char str and create a new array of ints -

i want fill array int values extracted buffer. want like:

char buffer[buff_max]; int numbers[num_max]; int = 0;      fgets(buffer, buff_max, stdin); while(sscanf(buffer, "%d", &numbers[i]) == 1) {     ++i; } 

but having kinds of problems using method. perhaps has \n in buffer? seems same value assigned every element , if type in greater around 130, garbage value stored.

the user typing in like:

12 543 5 234 9 

and want these values stored in numbers[] 5 different elements. there different amounts of numbers in buffer each time (depending on user types in).

you can find out sscanf() got in parsing string using %n conversion specifier, thus:

char buffer[buff_max]; int numbers[num_max]; int = 0; int offset = 0; int newlen;  if (fgets(buffer, buff_max, stdin) != 0) {     while (sscanf(buffer + offset, "%d%n", &numbers[i], &newlen) == 1 && < num_max)     {         ++i;         offset += newlen;     } } 

---

testing

#include <stdio.h> enum { buff_max = 1024, num_max = 32 };  int main(void) {     char buffer[buff_max];     int numbers[num_max];     int = 0;     int offset = 0;     int newlen;      if (fgets(buffer, buff_max, stdin) != 0)     {         while (sscanf(buffer + offset, "%d%n", &numbers[i], &newlen) == 1 && < num_max)         {             printf("found: numbers[%d] = %d\n", i, numbers[i]);             ++i;             offset += newlen;         }     }     return 0; } 

input string:

123 456 789 0123456 

output:

found: numbers[0] = 123 found: numbers[1] = 456 found: numbers[2] = 789 found: numbers[3] = 123456 

the %n modifier added in c89, not many people know there. 'works' in printf() family of functions, more lethal there because people aren't used seeing output parameters in printf() format string. @ least scanf() et al, expecting inputs.

beware of 'format string vulnerabilities', decent search term use in favourite search engine. should beware of them, independently of question.

[updated check fgets() not indicate error or eof. check read operations expected. well, — if you're recovering error , don't care read because won't using it, maybe don't need check. if you're going use read data, should check got data work with.]