| 13 |
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message) |
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message) |
| 14 |
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message) |
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message) |
| 15 |
|
|
| 16 |
|
#define MAX_LINE_LENGTH 80 |
| 17 |
|
|
| 18 |
|
|
| 19 |
/* check for prime number */ |
/* check for prime number */ |
| 20 |
BOOL is_prime(long int number) |
BOOL is_prime(long int number) |
| 21 |
{ |
{ |
| 43 |
/* invalid characters? */ |
/* invalid characters? */ |
| 44 |
if (*endptr != '\0') { |
if (*endptr != '\0') { |
| 45 |
char message[254]; |
char message[254]; |
| 46 |
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); |
| 47 |
PRINTERROR(message); |
PRINTERROR(message); |
| 48 |
exit(EXIT_FAILURE); |
exit(EXIT_FAILURE); |
| 49 |
} |
} |
| 91 |
|
|
| 92 |
/* (2) file mode: read numbers from file */ |
/* (2) file mode: read numbers from file */ |
| 93 |
} else { |
} else { |
| 94 |
char entry[81]; |
char line[MAX_LINE_LENGTH + 1]; |
| 95 |
long int number; |
long int number; |
| 96 |
long int lineno = 0; |
int line_length; |
| 97 |
while (fgets(entry, 81, fp)) { |
long int line_no = 0; |
| 98 |
|
while (fgets(line, MAX_LINE_LENGTH + 1, fp)) { |
| 99 |
|
|
| 100 |
/* count line number (for warnings) */ |
/* count line number (for warnings) */ |
| 101 |
lineno++; |
line_no++; |
| 102 |
|
|
| 103 |
|
line_length = strlen(line); |
| 104 |
|
|
| 105 |
/* skip empty lines */ |
/* skip empty lines */ |
| 106 |
if (strlen(entry) < 2) continue; |
if (strlen(line) < 2) continue; |
| 107 |
|
|
| 108 |
/* line handling: policy = skip exceeding lines */ |
/* line handling: policy = skip exceeding lines */ |
| 109 |
|
|
|
/* if last char is newline, strip it */ |
|
|
if (entry[strlen(entry)-1] == '\n') { |
|
|
entry[strlen(entry)-1] = '\0'; |
|
|
|
|
| 110 |
/* line exceeds max length */ |
/* line exceeds max length */ |
| 111 |
} else { |
if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') { |
| 112 |
char message[254]; |
char message[254]; |
| 113 |
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); |
| 114 |
PRINTWARNING(message); |
PRINTWARNING(message); |
| 115 |
|
|
| 116 |
/* eat all characters until newline */ |
/* eat all characters until newline or EOF */ |
| 117 |
while (fgetc(fp) != 10); |
while (1) { |
| 118 |
|
int charcode = fgetc(fp); |
| 119 |
|
if (charcode == 10 || charcode == EOF) break; |
| 120 |
|
} |
| 121 |
|
|
| 122 |
/* skip this line from prime calculation */ |
/* skip this line from prime calculation */ |
| 123 |
continue; |
continue; |
| 124 |
} |
} |
| 125 |
|
|
| 126 |
number = convert_number(entry); |
/* if last char is newline, strip it */ |
| 127 |
|
if (line[line_length-1] == '\n') { |
| 128 |
|
line[line_length-1] = '\0'; |
| 129 |
|
} |
| 130 |
|
|
| 131 |
|
/* finally: prime number calculation and output */ |
| 132 |
|
number = convert_number(line); |
| 133 |
PRINTPRIME(number); |
PRINTPRIME(number); |
| 134 |
|
|
| 135 |
} |
} |
| 136 |
fclose(fp); |
fclose(fp); |
| 137 |
} |
} |