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#include <limits.h> |
#include <limits.h> |
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#include <errno.h> |
#include <errno.h> |
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#ifdef _MSC_VER |
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#define snprintf _snprintf |
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#endif |
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#define BOOL int |
#define BOOL int |
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#define TRUE 1 |
#define TRUE 1 |
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#define FALSE 0 |
#define FALSE 0 |
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#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message) |
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message) |
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#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message) |
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message) |
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#define MAX_LINE_LENGTH 80 |
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/* check for prime number */ |
/* check for prime number */ |
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BOOL is_prime(long int number) |
BOOL is_prime(long int number) |
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{ |
{ |
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/* invalid characters? */ |
/* invalid characters? */ |
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if (*endptr != '\0') { |
if (*endptr != '\0') { |
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char message[254]; |
char message[254]; |
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snprintf(message, 256, "Could not convert '%s' to a valid number.", nptr); |
snprintf(message, 256, "Could not convert '%s' to a valid (integer) number.", nptr); |
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PRINTERROR(message); |
PRINTERROR(message); |
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exit(EXIT_FAILURE); |
exit(EXIT_FAILURE); |
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} |
} |
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/* (2) file mode: read numbers from file */ |
/* (2) file mode: read numbers from file */ |
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} else { |
} else { |
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char entry[81]; |
char line[MAX_LINE_LENGTH + 1]; |
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long int number; |
long int number; |
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long int lineno = 0; |
int line_length; |
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while (fgets(entry, 81, fp)) { |
long int line_no = 0; |
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while (fgets(line, MAX_LINE_LENGTH + 1, fp)) { |
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/* count line number (for warnings) */ |
/* count line number (for warnings) */ |
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lineno++; |
line_no++; |
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line_length = strlen(line); |
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/* skip empty lines */ |
/* skip empty lines */ |
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if (strlen(entry) < 2) continue; |
if (strlen(line) < 2) continue; |
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/* line handling: policy = skip exceeding lines */ |
/* line handling: policy = skip exceeding lines */ |
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/* if last char is newline, strip it */ |
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if (entry[strlen(entry)-1] == '\n') { |
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entry[strlen(entry)-1] = '\0'; |
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/* line exceeds max length */ |
/* line exceeds max length */ |
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} else { |
if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') { |
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char message[254]; |
char message[254]; |
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snprintf(message, 256, "Line too long (max 80 chars) in line number: %i", lineno); |
snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no); |
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PRINTWARNING(message); |
PRINTWARNING(message); |
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/* eat all characters until newline */ |
/* eat all characters until newline or EOF */ |
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while (fgetc(fp) != 10); |
while (1) { |
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int charcode = fgetc(fp); |
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if (charcode == 10 || charcode == EOF) break; |
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} |
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/* skip this line from prime calculation */ |
/* skip this line from prime calculation */ |
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continue; |
continue; |
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} |
} |
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number = convert_number(entry); |
/* if last char is newline, strip it */ |
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if (line[line_length-1] == '\n') { |
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line[line_length-1] = '\0'; |
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} |
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/* finally: prime number calculation and output */ |
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number = convert_number(line); |
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PRINTPRIME(number); |
PRINTPRIME(number); |
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} |
} |
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fclose(fp); |
fclose(fp); |
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} |
} |