BSArch/01/prime.c

/* $Id: prime.c,v 1.13 2006/05/13 18:53:54 joko Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include <errno.h>

#ifdef _MSC_VER
#define snprintf _snprintf
#endif

#define BOOL int
#define TRUE 1
#define FALSE 0

#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)

#define MAX_LINE_LENGTH 80


/* check for prime number */
BOOL is_prime(long int number)
{
        int i,sq;
        /* negative values, 0 and 1 are never prime numbers */
        if (number < 2) return FALSE;
        sq=sqrt(number);
        
        /* check all numbers 2..sqrt(number) for being a prime number */
        for (i=2; i <= sq; i++) {
                if ((number % i) == 0)
                        return FALSE;
        }
        return TRUE;
}

/* convert from string to long int, with error checking */
long int convert_number(const char *nptr, BOOL warn) {
        
        char * endptr;
        errno = 0;
        long int number = strtol(nptr, &endptr, 10);
        
        /* invalid characters? */
        if (*endptr != '\0') {
                char message[256];
                snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
                if(warn) 
                        PRINTWARNING(message);
                else{
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        /* invalid range? */
        /* if (number == LONG_MAX || number == LONG_MIN) { */
        if (errno == ERANGE) {
                char message[256];
                snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
                if(warn)
                        PRINTWARNING(message);
                else{                   
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        return number;
        
}

int main(int argc, char * argv[])
{
        
        if (argc == 1) {
                PRINTERROR("No arguments given.");
                exit(EXIT_FAILURE);
        }
        
        /* (3) range mode */
        if (argc > 2) {
                long int i, j;
                i = convert_number(argv[1],FALSE);
                j = convert_number(argv[2],FALSE);
                for (i; i< j; i++) {
                        PRINTPRIME(i);
                }
        
        /* other modes */
        } else {
                int err;
                /* try to open file for reading */
                FILE * fp = fopen(argv[1], "r");
                err=errno;
                /* (1) test-single-number mode: first argument is not a filename */
                if (fp == NULL) {
                        long int number = convert_number(argv[1],TRUE);
                        if(err){
                                fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
                                return -1;
                        }
                        PRINTPRIME(number);
                
                /* (2) file mode: read numbers from file */
                } else {
                        char line[MAX_LINE_LENGTH + 1];
                        long int number;
                        int line_length;
                        long int line_no = 0;
                        while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
                                
                                /* count line number (for warnings) */
                                line_no++;

                                line_length = strlen(line);
                                
                                /* skip empty lines */
                                if (strlen(line) < 2) continue;

                                /* line handling: policy = skip exceeding lines */
                                
                                /* line exceeds max length */
                                if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
                                        char message[254];
                                        snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
                                        PRINTWARNING(message);
                                        
                                        /* eat all characters until newline or EOF */
                                        while (1) {
                                                int charcode = fgetc(fp);
                                                if (charcode == 10 || charcode == EOF) break;
                                        }
                                        
                                        /* skip this line from prime calculation */
                                        continue;
                                }
                                
                                /* if last char is newline, strip it */
                                if (line[line_length-1] == '\n') {
                                        line[line_length-1] = '\0';
                                }
                                
                                /* finally: prime number calculation and output */
                                number = convert_number(line,FALSE);
                                PRINTPRIME(number);
                                
                        }
                        fclose(fp);
                }
        }
}
1	/* $Id: prime.c,v 1.13 2006/05/13 18:53:54 joko Exp $ */
2
3	#include <stdio.h>
4	#include <stdlib.h>
5	#include <math.h>
6	#include <limits.h>
7	#include <errno.h>
8
9	#ifdef _MSC_VER
10	#define snprintf _snprintf
11	#endif
12
13	#define BOOL int
14	#define TRUE 1
15	#define FALSE 0
16
17	#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
18	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
19	#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)
20
21	#define MAX_LINE_LENGTH 80
22
23
24	/* check for prime number */
25	BOOL is_prime(long int number)
26	{
27	int i,sq;
28	/* negative values, 0 and 1 are never prime numbers */
29	if (number < 2) return FALSE;
30	sq=sqrt(number);
31
32	/* check all numbers 2..sqrt(number) for being a prime number */
33	for (i=2; i <= sq; i++) {
34	if ((number % i) == 0)
35	return FALSE;
36	}
37	return TRUE;
38	}
39
40	/* convert from string to long int, with error checking */
41	long int convert_number(const char *nptr, BOOL warn) {
42
43	char * endptr;
44	errno = 0;
45	long int number = strtol(nptr, &endptr, 10);
46
47	/* invalid characters? */
48	if (*endptr != '\0') {
49	char message[256];
50	snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
51	if(warn)
52	PRINTWARNING(message);
53	else{
54	PRINTERROR(message);
55	exit(EXIT_FAILURE);
56	}
57	}
58
59	/* invalid range? */
60	/* if (number == LONG_MAX \|\| number == LONG_MIN) { */
61	if (errno == ERANGE) {
62	char message[256];
63	snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
64	if(warn)
65	PRINTWARNING(message);
66	else{
67	PRINTERROR(message);
68	exit(EXIT_FAILURE);
69	}
70	}
71
72	return number;
73
74	}
75
76	int main(int argc, char * argv[])
77	{
78
79	if (argc == 1) {
80	PRINTERROR("No arguments given.");
81	exit(EXIT_FAILURE);
82	}
83
84	/* (3) range mode */
85	if (argc > 2) {
86	long int i, j;
87	i = convert_number(argv[1],FALSE);
88	j = convert_number(argv[2],FALSE);
89	for (i; i< j; i++) {
90	PRINTPRIME(i);
91	}
92
93	/* other modes */
94	} else {
95	int err;
96	/* try to open file for reading */
97	FILE * fp = fopen(argv[1], "r");
98	err=errno;
99	/* (1) test-single-number mode: first argument is not a filename */
100	if (fp == NULL) {
101	long int number = convert_number(argv[1],TRUE);
102	if(err){
103	fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
104	return -1;
105	}
106	PRINTPRIME(number);
107
108	/* (2) file mode: read numbers from file */
109	} else {
110	char line[MAX_LINE_LENGTH + 1];
111	long int number;
112	int line_length;
113	long int line_no = 0;
114	while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
115
116	/* count line number (for warnings) */
117	line_no++;
118
119	line_length = strlen(line);
120
121	/* skip empty lines */
122	if (strlen(line) < 2) continue;
123
124	/* line handling: policy = skip exceeding lines */
125
126	/* line exceeds max length */
127	if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
128	char message[254];
129	snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
130	PRINTWARNING(message);
131
132	/* eat all characters until newline or EOF */
133	while (1) {
134	int charcode = fgetc(fp);
135	if (charcode == 10 \|\| charcode == EOF) break;
136	}
137
138	/* skip this line from prime calculation */
139	continue;
140	}
141
142	/* if last char is newline, strip it */
143	if (line[line_length-1] == '\n') {
144	line[line_length-1] = '\0';
145	}
146
147	/* finally: prime number calculation and output */
148	number = convert_number(line,FALSE);
149	PRINTPRIME(number);
150
151	}
152	fclose(fp);
153	}
154	}
155	}
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