Function extract_cpuinfo_field

numpy/core/src/common/npy_cpuinfo_parser.h:132–182

* Extract the content of a the first occurrence of a given field in * the content of /proc/cpuinfo and return it as a heap-allocated * string that must be freed by the caller. * * Return NULL if not found */

 * Return NULL if not found
 */
static char*
extract_cpuinfo_field(const char* buffer, int buflen, const char* field)
{
    int fieldlen = strlen(field);
    const char* bufend = buffer + buflen;
    char* result = NULL;
    int len;
    const char *p, *q;

    /* Look for first field occurrence, and ensures it starts the line. */
    p = buffer;
    for (;;) {
        p = memmem(p, bufend-p, field, fieldlen);
        if (p == NULL) {
            goto EXIT;
        }

        if (p == buffer || p[-1] == '\n') {
            break;
        }

        p += fieldlen;
    }

    /* Skip to the first column followed by a space */
    p += fieldlen;
    p = memchr(p, ':', bufend-p);
    if (p == NULL || p[1] != ' ') {
        goto EXIT;
    }

    /* Find the end of the line */
    p += 2;
    q = memchr(p, '\n', bufend-p);
    if (q == NULL) {
        q = bufend;
    }

    /* Copy the line into a heap-allocated buffer */
    len = q - p;
    result = malloc(len + 1);
    if (result == NULL) {
        goto EXIT;
    }

    memcpy(result, p, len);
    result[len] = '\0';

EXIT:
    return result;
}

/* 
 * Checks that a space-separated list of items contains one given 'item'.